Have copies of docs at stable/ and dev/

[lilyminium]

Fixes #2966

Changes made in this Pull Request:

• Copies the latest release to https://docs.mdanalysis.org/stable/
• Copies latest dev docs to https://docs.mdanalysis.org/dev
• Allows docs to be intersphinxed at above URLs

This is a copy of #2968 for master.

PR Checklist

• Tests?
• Docs?
• CHANGELOG updated?
• Issue raised/referenced?

[pep8speaks]

Hello @lilyminium! Thanks for opening this PR. We checked the lines you've touched for PEP 8 issues, and found:

• In the file maintainer/update_json_stubs_sitemap.py:

Line 118:80: E501 line too long (87 > 79 characters)
Line 119:80: E501 line too long (92 > 79 characters)

[codecov]

Codecov Report

Merging #2970 into master will increase coverage by 0.11%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2970      +/-   ##
==========================================
+ Coverage   91.33%   91.45%   +0.11%     
==========================================
  Files         166      165       -1     
  Lines       22549    22748     +199     
  Branches     3180     3186       +6     
==========================================
+ Hits        20595    20804     +209     
+ Misses       1326     1318       -8     
+ Partials      628      626       -2     

Impacted Files	Coverage Δ
auxiliary/base.py	90.84% <0.00%> (-0.56%)	⬇️
coordinates/base.py	94.42% <0.00%> (-0.30%)	⬇️
util.py	88.19% <0.00%> (-0.09%)	⬇️
package/MDAnalysis/core/topology.py	100.00% <0.00%> (ø)
package/MDAnalysis/analysis/polymer.py	100.00% <0.00%> (ø)
package/MDAnalysis/coordinates/MMTF.py	100.00% <0.00%> (ø)
package/MDAnalysis/coordinates/NAMDBIN.py	100.00% <0.00%> (ø)
...alysis/analysis/encore/clustering/affinityprop.pyx
package/MDAnalysis/core/selection.py	99.51% <0.00%> (+<0.01%)	⬆️
package/MDAnalysis/topology/PQRParser.py	98.93% <0.00%> (+0.01%)	⬆️
... and 39 more

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