docs: use requirements files to install themes and plugins

docs/conf.py

@@ -28,7 +28,15 @@
 
 # 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.intersphinx', 'sphinx.ext.ifconfig', 'sphinx.ext.todo']
+extensions = [
+    "sphinx.ext.duration",
+    "sphinx.ext.doctest",
+    "sphinx.ext.autodoc",
+    "sphinx.ext.ifconfig",
+    "sphinx.ext.autosummary",
+    "sphinx.ext.todo",
+    "sphinx.ext.intersphinx",
+]
 
 # Add any paths that contain templates here, relative to this directory.
 templates_path = ['_templates']

docs/requirements.in

@@ -0,0 +1,2 @@
+Sphinx>=5,<6
+sphinx_rtd_theme

docs/requirements.txt

@@ -0,0 +1,58 @@
+#
+# This file is autogenerated by pip-compile with python 3.10
+# To update, run:
+#
+#    pip-compile docs/requirements.in
+#
+alabaster==0.7.12
+    # via sphinx
+babel==2.10.3
+    # via sphinx
+certifi==2022.6.15
+    # via requests
+charset-normalizer==2.1.0
+    # via requests
+docutils==0.17.1
+    # via
+    #   sphinx
+    #   sphinx-rtd-theme
+idna==3.3
+    # via requests
+imagesize==1.4.1
+    # via sphinx
+jinja2==3.1.2
+    # via sphinx
+markupsafe==2.1.1
+    # via jinja2
+packaging==21.3
+    # via sphinx
+pygments==2.12.0
+    # via sphinx
+pyparsing==3.0.9
+    # via packaging
+pytz==2022.1
+    # via babel
+requests==2.28.1
+    # via sphinx
+snowballstemmer==2.2.0
+    # via sphinx
+sphinx==5.0.2
+    # via
+    #   -r docs/requirements.in
+    #   sphinx-rtd-theme
+sphinx-rtd-theme==1.0.0
+    # via -r docs/requirements.in
+sphinxcontrib-applehelp==1.0.2
+    # via sphinx
+sphinxcontrib-devhelp==1.0.2
+    # via sphinx
+sphinxcontrib-htmlhelp==2.0.0
+    # via sphinx
+sphinxcontrib-jsmath==1.0.1
+    # via sphinx
+sphinxcontrib-qthelp==1.0.3
+    # via sphinx
+sphinxcontrib-serializinghtml==1.1.5
+    # via sphinx
+urllib3==1.26.9
+    # via requests