Modernize the packaging of rechunker a bit

[ocefpaf]

This should also make releasing a bit simpler. Just a GH tag, using the web interface.

[codecov[bot]]

Codecov Report

Merging #138 (63887a9) into master (d625b6d) will decrease coverage by 26.36%. The diff coverage is n/a.

@@             Coverage Diff             @@
##           master     #138       +/-   ##
===========================================
- Coverage   96.38%   70.03%   -26.36%     
===========================================
  Files          11       11               
  Lines         554      554               
  Branches      106      106               
===========================================
- Hits          534      388      -146     
- Misses         13      149      +136     
- Partials        7       17       +10     

Impacted Files	Coverage Δ
rechunker/algorithm.py	91.22% <ø> (ø)
rechunker/api.py	66.66% <ø> (-30.56%)	:arrow_down:

... and 6 files with indirect coverage changes

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[review-notebook-app[bot]]

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[ocefpaf]

I'll stop here and address the documentation in a fresh PR to avoid making this one too big. We need to update the API rst files or, better yet, autogenerate them, and decide on what to do with the tutorial.ipynb parts that are not executed (I kept it like it was before).

PS: I suggest to remove the reviewnb app now that GH has a notebook diff. They look really nice: