Switch doxygen documentation theme

[ischoegl]

Changes proposed in this pull request

Use modern doxygen-awesome-css theme (as mentioned in https://github.com/Cantera/enhancements/issues/115#issuecomment-1477177638) and put details on top via customized xml layout

Rendered Webpage

vs. current theme (after #1543)

Relevant Issues

Somewhat relevant to Cantera/enhancements#115

Checklist

• [x] The pull request includes a clear description of this code change
• [x] Commit messages have short titles and reference relevant issues
• [x] Build passes (scons build & scons test) and unit tests address code coverage
• [x] Style & formatting of contributed code follows contributing guidelines
• [x] The pull request is ready for review

[codecov[bot]]

Codecov Report

Merging #1546 (071d862) into main (6fc22c4) will decrease coverage by 0.01%. The diff coverage is n/a.

:exclamation: Current head 071d862 differs from pull request most recent head 3c56269. Consider uploading reports for the commit 3c56269 to get more accurate results

@@            Coverage Diff             @@
##             main    #1546      +/-   ##
==========================================
- Coverage   70.50%   70.50%   -0.01%     
==========================================
  Files         376      379       +3     
  Lines       59081    59091      +10     
  Branches    21222    21228       +6     
==========================================
+ Hits        41657    41661       +4     
- Misses      14344    14351       +7     
+ Partials     3080     3079       -1     

Impacted Files	Coverage Δ
include/cantera/base/AnyMap.h	80.00% <ø> (ø)
include/cantera/base/Array.h	82.75% <ø> (ø)
include/cantera/base/ExternalLogger.h	39.13% <ø> (ø)
include/cantera/base/Interface.h	100.00% <ø> (ø)
include/cantera/base/NoExitLogger.h	0.00% <ø> (ø)
include/cantera/base/Solution.h	87.50% <ø> (ø)
include/cantera/base/SolutionArray.h	94.44% <ø> (ø)
include/cantera/base/Units.h	90.90% <ø> (ø)
include/cantera/base/YamlWriter.h	100.00% <ø> (ø)
include/cantera/base/ctexceptions.h	60.86% <ø> (ø)
... and 68 more

... and 15 files with indirect coverage changes

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[ischoegl]

I added a couple of tweaks that became possible with DoxygenLayout.xml, and fixed a couple of formatting glitches I stumbled across. I am not planning on adding anything else, i.e. this is ready for a review. (I also checked that the GH doxygen artifacts look as expected).