Bump sphinx-rtd-theme from 1.3.0 to 2.0.0 (#780)

Bumps [sphinx-rtd-theme](https://github.com/readthedocs/sphinx_rtd_theme) from 1.3.0 to 2.0.0.
- [Changelog](https://github.com/readthedocs/sphinx_rtd_theme/blob/master/docs/changelog.rst)
- [Commits](readthedocs/sphinx_rtd_theme@1.3.0...2.0.0)

---
updated-dependencies:
- dependency-name: sphinx-rtd-theme
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

docs/requirements.txt

@@ -82,7 +82,7 @@ sphinx==7.2.6
     #   sphinxcontrib-jquery
     #   sphinxcontrib-qthelp
     #   sphinxcontrib-serializinghtml
-sphinx-rtd-theme==1.3.0
+sphinx-rtd-theme==2.0.0
     # via -r docs/requirements.in
 sphinxcontrib-applehelp==1.0.7
     # via sphinx