Bump sphinx-rtd-theme from 1.3.0 to 2.0.0

[dependabot[bot]]

Bumps sphinx-rtd-theme from 1.3.0 to 2.0.0.

Changelog

Sourced from sphinx-rtd-theme's changelog.

2.0.0

Added

• Support for Sphinx versions 6.x and 7.x
• Support for docutils <=0.20

Deprecations

• The HTML4 writer is now officially deprecated. An error will be thrown if your project configuration still uses the HTML4 writer.
• Support for Sphinx versions < 5.0 was removed.
• In addition, our supported dependencies will match the dependencies from our lowest supported Sphinx release, version 5.0: Python >= 3.6 and docutils > 0.14 and < 0.19

.. _release-1.3.0:

Commits

• 7c9b1b5 Release 2.0 final (#1544)
• c104410 Bump for next potential release, 2.0.0rc5 (#1539)
• 53ca116 Release 2.0.0rc4 (#1538)
• 4498e97 Fix AttributeError when one of css_files is a string (#1537)
• 84aea9b Increment for next potential release (#1536)
• febde39 Release 2.0.0rc3 (#1535)
• 32310a8 Fix #1522: fix 'str' object has no attribute 'attributes' (#1528)
• 8ce23ce Version bump for 2.0rc3 development (#1521)
• 46f5307 Release 2.0rc2 (#1520)
• 5838e6a Add support for docutils==0.20.x (#1517)
• Additional commits viewable in compare view

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Dependabot will merge this PR once CI passes on it, as requested by @khaeru.

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[codecov[bot]]

Codecov Report

Merging #764 (3530912) into main (32779c2) will not change coverage. The diff coverage is n/a.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #764 +/- ## ===================================== Coverage 95.2% 95.2% ===================================== Files 46 46 Lines 4312 4312 ===================================== Hits 4107 4107 Misses 205 205 ```

[khaeru]

With the latest sphinx-rtd-theme and sphinxcontrib-bibtex, it is now possible to use docutils >= 0.20. I regenerated doc/requirements.txt accordingly.

Since this PR updates the base theme for our docs, I'll next check the automatic RTD build and then—if all looks okay—have the bot automerge.

[khaeru]

Seems fine: https://iiasa-energy-program-message-ix--764.com.readthedocs.build/en/764/install.html

So:

@dependabot squash and merge