Add Readthedocs config

[jwodder]

Part of #713.

[codecov]

Codecov Report

Merging #715 (6fdb8f3) into master (a33b3f9) will decrease coverage by 0.15%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #715      +/-   ##
==========================================
- Coverage   84.02%   83.86%   -0.16%     
==========================================
  Files          59       59              
  Lines        5659     5659              
==========================================
- Hits         4755     4746       -9     
- Misses        904      913       +9     

Flag	Coverage Δ
unittests	83.86% <ø> (-0.16%)	⬇️

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Impacted Files	Coverage Δ
dandi/conftest.py	38.46% <0.00%> (-61.54%)	⬇️
dandi/delete.py	90.97% <0.00%> (-0.70%)	⬇️

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[satra]

@yarikoptic - any reason to not just use gh-pages? if you do you would see this document at: www.dandiarchive.org/dandi-cli

[yarikoptic]

@yarikoptic - any reason to not just use gh-pages? if you do you would see this document at: www.dandiarchive.org/dandi-cli

• well, I guess we can use that as the top url on RTD as well, or assign/use dandi-cli.dandiarchive.org
• I like how it is possible to pre-view the PRs , see e.g. ES: Two access types version con/open-brain-consent#100 (leads to https://open-brain-consent--100.org.readthedocs.build/en/100/)
• no need for custom actions -- we still don't know what hard-reset master on the handbook has happened ;)
• edit: can have multiple versions (e.g. released and master versions and all previous releases ;-) )