Bump sphinx+sphinx-rtd-theme, and properly install sphinx-rtd-theme (#1233)

* Bump sphinx-rtd-theme from 1.2.2 to 1.3.0 in /requirements

Bumps [sphinx-rtd-theme](https://github.com/readthedocs/sphinx_rtd_theme) from 1.2.2 to 1.3.0.
- [Changelog](https://github.com/readthedocs/sphinx_rtd_theme/blob/master/docs/changelog.rst)
- [Commits](readthedocs/sphinx_rtd_theme@1.2.2...1.3.0)

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

Signed-off-by: dependabot[bot] <support@github.com>

* Bump sphinx from 6.2.1 to 7.2.2 in /requirements

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 6.2.1 to 7.2.2.
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/master/CHANGES)
- [Commits](sphinx-doc/sphinx@v6.2.1...v7.2.2)

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

Signed-off-by: dependabot[bot] <support@github.com>

* Set sphinx_rtd_theme as html_theme + extensions

...as per the installation instructions at
https://sphinx-rtd-theme.readthedocs.io/en/1.3.0/installing.html.
This should admittedly have been done in
c3119b0, when originally adding
`sphinx-rtd-theme` as a requirement.

Lastly, it seems like the `html_theme` config setting was recently made
required, since only today's builds fail (see e.g.
https://readthedocs.org/projects/django-simple-history/builds/21687449/).

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Anders <6058745+ddabble@users.noreply.github.com>

Author: dependabot[bot]

docs/conf.py

@@ -25,7 +25,10 @@
 
 # Add any Sphinx extension module names here, as strings. They can be extensions
 # coming with Sphinx (named 'sphinx.ext.*') or your custom ones.
-extensions = ["sphinx.ext.autodoc"]
+extensions = [
+    "sphinx.ext.autodoc",
+    "sphinx_rtd_theme",
+]
 
 # Add any paths that contain templates here, relative to this directory.
 templates_path = ["_templates"]
@@ -93,7 +96,7 @@
 
 # The theme to use for HTML and HTML Help pages.  See the documentation for
 # a list of builtin themes.
-# html_theme = 'default'
+html_theme = "sphinx_rtd_theme"
 
 # Theme options are theme-specific and customize the look and feel of a theme
 # further.  For a list of options available for each theme, see the

requirements/docs.txt

@@ -1,4 +1,4 @@
 # Install this project in editable mode, so that its package metadata can be queried
 -e .
-Sphinx==6.2.1
-sphinx-rtd-theme==1.2.2
+Sphinx==7.2.2
+sphinx-rtd-theme==1.3.0