docs: remove remaining CSS workaround

Remove a workaround for a CSS issue in older Firefox versions, which was
recently fixed (at some point between Firefox 102 and 108). Firefox 108+
now displays the bullet points at the right vertical position even without
the hack in [1].

[1] https://gluon.readthedocs.io/en/latest/releases/v2018.1.html#site-conf

docs/_static/css/custom.css

@@ -1,10 +0,0 @@
-/*
-	This fixes the vertical position of list markers when the first
-	element in the <li> is a <pre> block
-
-	Scrolling inside the <pre> block is still working as expected
-*/
-.rst-content pre.literal-block,
-.rst-content div[class^='highlight'] pre {
-	overflow: visible;
-}

docs/conf.py

@@ -89,7 +89,7 @@ html_theme = 'sphinx_rtd_theme'
 # relative to this directory. They are copied after the builtin static files,
 # so a file named "default.css" will overwrite the builtin "default.css".
 #
-html_static_path = ['_static']
+# html_static_path = ['_static']
 
 # Custom sidebar templates, must be a dictionary that maps document names
 # to template names.
@@ -103,7 +103,7 @@ html_static_path = ['_static']
 
 # These paths are either relative to html_static_path
 # or fully qualified paths (eg. https://...)
-html_css_files = ['css/custom.css']
+# html_css_files = ['css/custom.css']
 
 
 # -- Options for HTMLHelp output ---------------------------------------------