[Bug]: Read The Docs build failing because of contributors graph not being rendered correctly with pdflatex

What happened?

The Read The Docs build is failing because the PDF generation portion fails.
This started happening after merging #650.
https://readthedocs.org/projects/xcdat/builds/24629377/
What did you expect to happen? Are there are possible answers you came across?

~~I think we have to replace all .png images with .svg in the notebooks because the latex pdf generator package doesn't seem to be able to export the documentation as PDF.~~
The contributors graph portion of the index.rst was not being built properly with pdflatex, causing the pdf export to fail.
Minimal Complete Verifiable Example (MVCE)

N/A
Relevant log output

Use of uninitialized value in concatenation (.) or string at (eval 13) line 1, <GEN1> chunk 1.
Use of uninitialized value in concatenation (.) or string at (eval 13) line 2, <GEN1> chunk 1.
Use of uninitialized value in concatenation (.) or string at (eval 13) line 3, <GEN1> chunk 1.
Use of uninitialized value in concatenation (.) or string at (eval 13) line 4, <GEN1> chunk 1.
Subroutine makeglo redefined at (eval 14) line 7, <GEN2> chunk 1.
Use of uninitialized value in concatenation (.) or string at (eval 14) line 1, <GEN2> chunk 1.
Use of uninitialized value in concatenation (.) or string at (eval 14) line 2, <GEN2> chunk 1.
Use of uninitialized value in concatenation (.) or string at (eval 14) line 3, <GEN2> chunk 1.
Use of uninitialized value in concatenation (.) or string at (eval 14) line 4, <GEN2> chunk 1.
Latexmk: This is Latexmk, John Collins, 26 Dec. 2019, version: 4.67.
Rule 'pdflatex': The following rules & subrules became out-of-date:
      'pdflatex'
------------
Run number 1 of rule 'pdflatex'
------------
------------
Running 'pdflatex   -interaction=nonstopmode -recorder --jobname="xcdat"  "xcdat.tex"'
------------
Latexmk: applying rule 'pdflatex'...
This is pdfTeX, Version 3.14159265-2.6-1.40.20 (TeX Live 2019/Debian) (preloaded format=pdflatex)
 restricted \write18 enabled.
entering extended mode
(./xcdat.tex
LaTeX2e <2020-02-02> patch level 2
L3 programming layer <2020-02-14> (./sphinxmanual.cls
Document Class: sphinxmanual 2019/12/01 v2.3.0 Document class (Sphinx manual)
(/usr/share/texlive/texmf-dist/tex/latex/base/report.cls
Document Class: report 2019/12/20 v1.4l Standard LaTeX document class
(/usr/share/texlive/texmf-dist/tex/latex/base/size10.clo)))
(/usr/share/texlive/texmf-dist/tex/latex/base/inputenc.sty)
(/usr/share/texlive/texmf-dist/tex/latex/cmap/cmap.sty)
(/usr/share/texlive/texmf-dist/tex/latex/base/fontenc.sty<<t1.cmap>>)
(/usr/share/texlive/texmf-dist/tex/latex/amsmath/amsmath.sty
For additional information on amsmath, use the `?' option.
(/usr/share/texlive/texmf-dist/tex/latex/amsmath/amstext.sty
(/usr/share/texlive/texmf-dist/tex/latex/amsmath/amsgen.sty))
(/usr/share/texlive/texmf-dist/tex/latex/amsmath/amsbsy.sty)
(/usr/share/texlive/texmf-dist/tex/latex/amsmath/amsopn.sty))
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(/usr/share/texlive/texmf-dist/tex/generic/babel-english/english.ldf
(/usr/share/texlive/texmf-dist/tex/generic/babel/babel.def
(/usr/share/texlive/texmf-dist/tex/generic/babel/txtbabel.def))))
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(./sphinxoptionshyperref.sty) (./sphinxoptionsgeometry.sty)
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(/usr/share/texlive/texmf-dist/tex/latex/capt-of/capt-of.sty)
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(/usr/share/texlive/texmf-dist/tex/latex/graphics/graphicx.sty
(/usr/share/texlive/texmf-dist/tex/latex/graphics/graphics.sty
(/usr/share/texlive/texmf-dist/tex/latex/graphics/trig.sty)
(/usr/share/texlive/texmf-dist/tex/latex/graphics-cfg/graphics.cfg)))
(./sphinxlatexgraphics.sty) (./sphinxpackageboxes.sty
(/usr/share/texlive/texmf-dist/tex/latex/pict2e/pict2e.sty
(/usr/share/texlive/texmf-dist/tex/latex/pict2e/pict2e.cfg)
(/usr/share/texlive/texmf-dist/tex/latex/pict2e/p2e-pdftex.def))
(/usr/share/texlive/texmf-dist/tex/latex/ellipse/ellipse.sty))
(./sphinxlatexadmonitions.sty
(/usr/share/texlive/texmf-dist/tex/latex/framed/framed.sty))
(./sphinxlatexliterals.sty
(/usr/share/texlive/texmf-dist/tex/latex/fancyvrb/fancyvrb.sty)
(/usr/share/texlive/texmf-dist/tex/latex/base/alltt.sty)
(/usr/share/texlive/texmf-dist/tex/latex/upquote/upquote.sty)
(/usr/share/texlive/texmf-dist/tex/latex/needspace/needspace.sty))
(./sphinxlatexshadowbox.sty) (./sphinxlatexcontainers.sty)
(./sphinxhighlight.sty) (./sphinxlatextables.sty
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(/usr/share/texlive/texmf-dist/tex/latex/tools/longtable.sty)
(/usr/share/texlive/texmf-dist/tex/latex/varwidth/varwidth.sty)
(/usr/share/texlive/texmf-dist/tex/latex/colortbl/colortbl.sty)
(/usr/share/texlive/texmf-dist/tex/latex/booktabs/booktabs.sty))
(./sphinxlatexnumfig.sty) (./sphinxlatexlists.sty) (./sphinxpackagefootnote.sty
) (./sphinxlatexindbibtoc.sty
(/usr/share/texlive/texmf-dist/tex/latex/base/makeidx.sty))
(./sphinxlatexstylepage.sty
(/usr/share/texlive/texmf-dist/tex/latex/parskip/parskip.sty
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(/usr/share/texlive/texmf-dist/tex/latex/fancyhdr/fancyhdr.sty))
(./sphinxlatexstyleheadings.sty
(/usr/share/texlive/texmf-dist/tex/latex/titlesec/titlesec.sty))
(./sphinxlatexstyletext.sty) (./sphinxlatexobjects.sty))
(/usr/share/texlive/texmf-dist/tex/latex/geometry/geometry.sty
(/usr/share/texlive/texmf-dist/tex/generic/iftex/ifvtex.sty
(/usr/share/texlive/texmf-dist/tex/generic/iftex/iftex.sty))) (./nbsphinx.sty)
(/usr/share/texlive/texmf-dist/tex/latex/hyperref/hyperref.sty
(/usr/share/texlive/texmf-dist/tex/latex/pdftexcmds/pdftexcmds.sty
(/usr/share/texlive/texmf-dist/tex/generic/infwarerr/infwarerr.sty))
(/usr/share/texlive/texmf-dist/tex/generic/kvdefinekeys/kvdefinekeys.sty)
(/usr/share/texlive/texmf-dist/tex/generic/pdfescape/pdfescape.sty)
(/usr/share/texlive/texmf-dist/tex/latex/hycolor/hycolor.sty)
(/usr/share/texlive/texmf-dist/tex/latex/letltxmacro/letltxmacro.sty)
(/usr/share/texlive/texmf-dist/tex/latex/auxhook/auxhook.sty)
(/usr/share/texlive/texmf-dist/tex/latex/hyperref/pd1enc.def)
(/usr/share/texlive/texmf-dist/tex/generic/intcalc/intcalc.sty)
(/usr/share/texlive/texmf-dist/tex/generic/etexcmds/etexcmds.sty)
(/usr/share/texlive/texmf-dist/tex/latex/hyperref/puenc.def)
(/usr/share/texlive/texmf-dist/tex/latex/url/url.sty)
(/usr/share/texlive/texmf-dist/tex/generic/bitset/bitset.sty
(/usr/share/texlive/texmf-dist/tex/generic/bigintcalc/bigintcalc.sty))
(/usr/share/texlive/texmf-dist/tex/generic/atbegshi/atbegshi.sty))
(/usr/share/texlive/texmf-dist/tex/latex/hyperref/hpdftex.def
(/usr/share/texlive/texmf-dist/tex/latex/atveryend/atveryend.sty)
(/usr/share/texlive/texmf-dist/tex/latex/rerunfilecheck/rerunfilecheck.sty
(/usr/share/texlive/texmf-dist/tex/generic/uniquecounter/uniquecounter.sty)))
(/usr/share/texlive/texmf-dist/tex/latex/oberdiek/hypcap.sty)
(./sphinxmessages.sty)
Writing index file xcdat.idx
(/usr/share/texlive/texmf-dist/tex/latex/l3backend/l3backend-pdfmode.def)
(./xcdat.aux) (/usr/share/texmf/tex/latex/tex-gyre/t1qtm.fd)
(/usr/share/texlive/texmf-dist/tex/context/base/mkii/supp-pdf.mkii
[Loading MPS to PDF converter (version 2006.09.02).]
) (/usr/share/texlive/texmf-dist/tex/latex/epstopdf-pkg/epstopdf-base.sty
(/usr/share/texlive/texmf-dist/tex/latex/latexconfig/epstopdf-sys.cfg))
*geometry* driver: auto-detecting
*geometry* detected driver: pdftex
(/usr/share/texlive/texmf-dist/tex/latex/hyperref/nameref.sty
(/usr/share/texlive/texmf-dist/tex/latex/refcount/refcount.sty)
(/usr/share/texlive/texmf-dist/tex/generic/gettitlestring/gettitlestring.sty))
(/usr/share/texmf/tex/latex/tex-gyre/t1qhv.fd)<<ot1.cmap>><<oml.cmap>><<oms.cma
p>><<omx.cmap>> (/usr/share/texlive/texmf-dist/tex/latex/amsfonts/umsa.fd)
(/usr/share/texlive/texmf-dist/tex/latex/amsfonts/umsb.fd) [1{/var/lib/texmf/fo
nts/map/pdftex/updmap/pdftex.map}] [2] [1] [2]

! LaTeX Error: Unknown graphics extension: .svg.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...                                              

l.121 ...men,height=800\sphinxpxdimen]{{play}.svg}

! LaTeX Error: Unknown graphics extension: .svg.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...                                              

l.121 ...men,height=800\sphinxpxdimen]{{play}.svg}

LaTeX Warning: Hyper reference `getting-started-guide/index::doc' on page 1 und
efined on input line 128.

! LaTeX Error: Unknown graphics extension: .svg.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...                                              

l.143 ...men,height=800\sphinxpxdimen]{{plot}.svg}

! LaTeX Error: Unknown graphics extension: .svg.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...                                              

l.143 ...men,height=800\sphinxpxdimen]{{plot}.svg}

LaTeX Warning: Hyper reference `gallery::doc' on page 1 undefined on input line
 150.

! LaTeX Error: Unknown graphics extension: .svg.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...                                              

l.165 ...n,height=800\sphinxpxdimen]{{wrench}.svg}

! LaTeX Error: Unknown graphics extension: .svg.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...                                              

l.165 ...n,height=800\sphinxpxdimen]{{wrench}.svg}

LaTeX Warning: Hyper reference `api::doc' on page 1 undefined on input line 172
.

! LaTeX Error: Unknown graphics extension: .svg.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...                                              

l.187 ...men,height=800\sphinxpxdimen]{{book}.svg}

! LaTeX Error: Unknown graphics extension: .svg.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...                                              

l.187 ...men,height=800\sphinxpxdimen]{{book}.svg}

LaTeX Warning: Hyper reference `contributing::doc' on page 1 undefined on input
 line 194.

[1] [2]
Chapter 1.
(/usr/share/texlive/texmf-dist/tex/latex/txfonts/t1txtt.fd)

LaTeX Warning: Hyper reference `getting-started-guide/overview::doc' on page 3 
undefined on input line 252.

LaTeX Warning: Hyper reference `getting-started-guide/installation::doc' on pag
e 3 undefined on input line 274.

[3 <./dashboard.png> <./wrench.png>]

LaTeX Warning: Hyper reference `getting-started-guide/getting-started-hpc-jupyt
er::doc' on page 4 undefined on input line 296.

LaTeX Warning: Hyper reference `getting-started-guide/faqs::doc' on page 4 unde
fined on input line 318.

[4 <./server.png> <./faq.png>] (/usr/share/texmf/tex/latex/tex-gyre/ts1qtm.fd)
[5] [6]Syntax Error: Couldn't read xref table
Syntax Warning: PDF file is damaged - attempting to reconstruct xref table...
Syntax Error: Couldn't find trailer dictionary
Syntax Error: Couldn't read xref table

!pdfTeX error: pdflatex (file ./xcdat.pdf): xpdf: reading PDF image failed
 ==> Fatal error occurred, no output PDF file produced!
Latexmk: Index file 'xcdat.idx' was written
Rule 'makeindex xcdat.idx': File changes, etc:
   Changed files, or newly in use since previous run(s):
      'xcdat.idx'
------------
Run number 1 of rule 'makeindex xcdat.idx'
------------
=== TeX engine is 'pdfTeX'
Latexmk: applying rule 'makeindex xcdat.idx'...
------------
Running 'makeindex -s python.ist  -o "xcdat.ind" "xcdat.idx"'
------------
This is makeindex, version 2.15 [TeX Live 2019] (kpathsea + Thai support).
Scanning style file ./python.ist.......done (7 attributes redefined, 0 ignored).
Scanning input file xcdat.idx...done (0 entries accepted, 0 rejected).
Nothing written in xcdat.ind.
Transcript written in xcdat.ilg.
Rule 'pdflatex': File changes, etc:
   Changed files, or newly in use since previous run(s):
      'xcdat.aux'
      'xcdat.ind'
------------
Run number 2 of rule 'pdflatex'
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Latexmk: applying rule 'pdflatex'...
------------
Running 'pdflatex   -interaction=nonstopmode -recorder --jobname="xcdat"  "xcdat.tex"'
------------
This is pdfTeX, Version 3.14159265-2.6-1.40.20 (TeX Live 2019/Debian) (preloaded format=pdflatex)
 restricted \write18 enabled.
entering extended mode
(./xcdat.tex
LaTeX2e <2020-02-02> patch level 2
L3 programming layer <2020-02-14> (./sphinxmanual.cls
Document Class: sphinxmanual 2019/12/01 v2.3.0 Document class (Sphinx manual)
(/usr/share/texlive/texmf-dist/tex/latex/base/report.cls
Document Class: report 2019/12/20 v1.4l Standard LaTeX document class
(/usr/share/texlive/texmf-dist/tex/latex/base/size10.clo)))
(/usr/share/texlive/texmf-dist/tex/latex/base/inputenc.sty)
(/usr/share/texlive/texmf-dist/tex/latex/cmap/cmap.sty)
(/usr/share/texlive/texmf-dist/tex/latex/base/fontenc.sty<<t1.cmap>>)
(/usr/share/texlive/texmf-dist/tex/latex/amsmath/amsmath.sty
For additional information on amsmath, use the `?' option.
(/usr/share/texlive/texmf-dist/tex/latex/amsmath/amstext.sty
(/usr/share/texlive/texmf-dist/tex/latex/amsmath/amsgen.sty))
(/usr/share/texlive/texmf-dist/tex/latex/amsmath/amsbsy.sty)
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(./sphinxoptionshyperref.sty) (./sphinxoptionsgeometry.sty)
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(/usr/share/texlive/texmf-dist/tex/generic/bitset/bitset.sty
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(/usr/share/texlive/texmf-dist/tex/generic/atbegshi/atbegshi.sty))
(/usr/share/texlive/texmf-dist/tex/latex/hyperref/hpdftex.def
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(/usr/share/texlive/texmf-dist/tex/latex/rerunfilecheck/rerunfilecheck.sty
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(/usr/share/texlive/texmf-dist/tex/latex/oberdiek/hypcap.sty)
(./sphinxmessages.sty)
Writing index file xcdat.idx
(/usr/share/texlive/texmf-dist/tex/latex/l3backend/l3backend-pdfmode.def)
(./xcdat.aux) (/usr/share/texmf/tex/latex/tex-gyre/t1qtm.fd)
(/usr/share/texlive/texmf-dist/tex/context/base/mkii/supp-pdf.mkii
[Loading MPS to PDF converter (version 2006.09.02).]
) (/usr/share/texlive/texmf-dist/tex/latex/epstopdf-pkg/epstopdf-base.sty
(/usr/share/texlive/texmf-dist/tex/latex/latexconfig/epstopdf-sys.cfg))
*geometry* driver: auto-detecting
*geometry* detected driver: pdftex
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[5] [6]Syntax Error: Couldn't read xref table
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!pdfTeX error: pdflatex (file ./xcdat.pdf): xpdf: reading PDF image failed
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Latexmk: Index file 'xcdat.idx' was written
Rule 'pdflatex': File changes, etc:
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=== TeX engine is 'pdfTeX'
Latexmk: applying rule 'pdflatex'...
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Running 'pdflatex   -interaction=nonstopmode -recorder --jobname="xcdat"  "xcdat.tex"'
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This is pdfTeX, Version 3.14159265-2.6-1.40.20 (TeX Live 2019/Debian) (preloaded format=pdflatex)
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Writing index file xcdat.idx
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[Loading MPS to PDF converter (version 2006.09.02).]
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*geometry* driver: auto-detecting
*geometry* detected driver: pdftex
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(./xcdat.out) (./xcdat.out) (/usr/share/texmf/tex/latex/tex-gyre/t1qhv.fd)<<ot1
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! LaTeX Error: Unknown graphics extension: .svg.

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l.121 ...men,height=800\sphinxpxdimen]{{play}.svg}

! LaTeX Error: Unknown graphics extension: .svg.

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l.121 ...men,height=800\sphinxpxdimen]{{play}.svg}

! LaTeX Error: Unknown graphics extension: .svg.

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l.143 ...men,height=800\sphinxpxdimen]{{plot}.svg}

! LaTeX Error: Unknown graphics extension: .svg.

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l.143 ...men,height=800\sphinxpxdimen]{{plot}.svg}

LaTeX Warning: Hyper reference `gallery::doc' on page 1 undefined on input line
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l.165 ...n,height=800\sphinxpxdimen]{{wrench}.svg}

! LaTeX Error: Unknown graphics extension: .svg.

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l.165 ...n,height=800\sphinxpxdimen]{{wrench}.svg}

LaTeX Warning: Hyper reference `api::doc' on page 1 undefined on input line 172
.

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l.187 ...men,height=800\sphinxpxdimen]{{book}.svg}

! LaTeX Error: Unknown graphics extension: .svg.

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l.187 ...men,height=800\sphinxpxdimen]{{book}.svg}

LaTeX Warning: Hyper reference `contributing::doc' on page 1 undefined on input
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Chapter 1.
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LaTeX Warning: Hyper reference `getting-started-guide/installation::doc' on pag
e 3 undefined on input line 274.

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LaTeX Warning: Hyper reference `getting-started-guide/getting-started-hpc-jupyt
er::doc' on page 4 undefined on input line 296.

LaTeX Warning: Hyper reference `getting-started-guide/faqs::doc' on page 4 unde
fined on input line 318.

[4 <./server.png> <./faq.png>] (/usr/share/texmf/tex/latex/tex-gyre/ts1qtm.fd)
[5] [6]Syntax Error: Couldn't read xref table
Syntax Warning: PDF file is damaged - attempting to reconstruct xref table...
Syntax Error: Couldn't find trailer dictionary
Syntax Error: Couldn't read xref table

!pdfTeX error: pdflatex (file ./xcdat.pdf): xpdf: reading PDF image failed
 ==> Fatal error occurred, no output PDF file produced!
Latexmk: Index file 'xcdat.idx' was written
Failure to make 'xcdat.pdf'
Collected error summary (may duplicate other messages):
  pdflatex: Command for 'pdflatex' gave return code 1
      Refer to 'xcdat.log' for details
=== TeX engine is 'pdfTeX'
Latexmk: Errors, in force_mode: so I tried finishing targets
Anything else we need to know?

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Environment

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xCDAT / xcdat

[Bug]: Read The Docs build failing because of contributors graph not being rendered correctly with pdflatex #662
