drop sphinx_rtd_langs_theme (#137)

* drop sphinx_rtd_langs_theme

.github/workflows/release.yml

@@ -12,8 +12,7 @@ jobs:
       - uses: actions/checkout@v2
 
       - name: install sphinx
-        run: pip install sphinx docutils==0.16
-        # docutils should be < 0.17 for correct rendering. see https://stackoverflow.com/questions/67542699/readthedocs-sphinx-not-rendering-bullet-list-from-rst-file
+        run: pip install sphinx sphinx_rtd_theme
 
       - name: install graphviz and rclone
         run: sudo apt install graphviz rclone

.github/workflows/tests.yml

@@ -11,9 +11,7 @@ jobs:
     steps:
       - uses: actions/checkout@v2
       - name: install sphinx
-        run: pip install sphinx docutils==0.16
-        # docutils should be < 0.17 for correct rendering. see https://stackoverflow.com/questions/67542699/readthedocs-sphinx-not-rendering-bullet-list-from-rst-file
-
+        run: pip install sphinx sphinx_rtd_theme
 
       - name: install graphviz
         run: sudo apt install graphviz

en/conf.py

@@ -108,7 +108,7 @@
 
 # The theme to use for HTML and HTML Help pages.  See the documentation for
 # a list of builtin themes.
-html_theme = "sphinx_rtd_langs_theme"
+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
@@ -117,7 +117,7 @@
 # }
 
 # Add any paths that contain custom themes here, relative to this directory.
-html_theme_path = ["../themes"]
+#html_theme_path = ["../themes"]
 
 # The name for this set of Sphinx documents.  If None, it defaults to
 # "<project> v<release> documentation".