docs: use sphinx_rtd_theme

It is more modern than "flask", and handles the long marker names
better.

Author: blueyed

Diff for: docs/_templates/sidebarintro.html

@@ -34,25 +34,8 @@
 exclude_patterns = ['_build']
 
 pygments_style = 'sphinx'
-html_theme = 'flask'
-html_theme_options = {
-    # 'index_logo': '',
-    'github_fork': 'pytest-dev/pytest-django',
-}
-html_sidebars = {
-    'index': [
-        'sidebarintro.html',
-        'globaltoc.html',
-        'searchbox.html'
-    ],
-    '**': [
-        'globaltoc.html',
-        'relations.html',
-        'searchbox.html'
-    ]
-}
-# html_style = 'rtd.css'
-# RTD_NEW_THEME = True
+
+html_theme = 'sphinx_rtd_theme'
 
 # Add any paths that contain custom static files (such as style sheets) here,
 # relative to this directory. They are copied after the builtin static files,

Diff for: docs/conf.py

@@ -7,4 +7,4 @@ tox
 wheel
 twine
 flake8
-Flask-Sphinx-Themes
+sphinx_rtd_theme

Diff for: requirements.txt

@@ -34,7 +34,7 @@ def read(fname):
     extras_require={
         'docs': [
             'sphinx',
-            'Flask-Sphinx-Themes',
+            'sphinx_rtd_theme',
         ]
     },
     classifiers=['Development Status :: 5 - Production/Stable',