Remove unnecessary override CSS (#1554)

docs/source/_static/css/override.css

-/* Fix for bibtex reference */
-dl.footnote.brackets > dt.label > span.brackets > a.fn-backref {
-    position: inherit
-}
-/* Fix for bibtex back reference */
-dl.footnote.brackets > dt.label > span.fn-backref > a {
-    position: inherit
-}

docs/source/conf.py

@@ -137,7 +137,6 @@ html_logo = '_static/img/pytorch-logo-dark.svg'
 # so a file named "default.css" will overwrite the builtin "default.css".
 html_static_path = ['_static']
 html_css_files = [
-    'css/override.css',
     'https://cdn.jsdelivr.net/npm/katex@0.10.0-beta/dist/katex.min.css'
 ]