Remove matplotlib-specific CSS

Sphinx-gallery is only used in Matplotlib, so we don't need its CSS
here. The multi-column ToC is a Matplotlib-specific CSS for the Axes API
page only.

Author: QuLogic

mpl_sphinx_theme/static/css/style.css

@@ -12,65 +12,6 @@ html[data-theme="dark"] {
   --pst-color-text-base: rgb(240, 240, 240);
 }
 
-.simple li>p {
-  margin: 0;
-}
-
-/* multi colunm TOC */
-.contents ul {
-  list-style-type: none;
-  padding-left: 2em;
-}
-
-.contents > ul {
-  padding-left: 0;
-}
-
-.multicol-toc > ul {
-  column-width: 250px;
-  column-gap: 60px;
-  -webkit-column-width: 250px;
-  -moz-column-width: 250px;
-  column-rule: 1px solid #ccc;
-}
-
-.multicol-toc > li {
-     /* break inside is not yet broadly supported, but we just try */
-  break-inside: avoid-column;
-  -moz-break-inside: avoid-column;
-  -webkit-break-inside: avoid-column;
-}
-
-.contents > ul > li > a {
-  font-size: 1.0em;
-}
-
-/* Hide red ¶ between the thumbnail and caption in gallery
-
-Due the way that sphinx-gallery floats its captions the perma-link
-does not float with it.
-*/
-.sphx-glr-thumbcontainer p.caption:hover > a.headerlink{
-  visibility: hidden;
-
-}
-
-/* slightly reduce horizontal margin compared to gallery.css to
-* get four columns of thumbnails in the pydata-sphinx-theme. */
-.sphx-glr-thumbcontainer {
-  margin: 5px 2px;
-}
-
-/* workaround: the default padding decenters the image inside the frame */
-.sphx-glr-thumbcontainer .figure {
-  padding: 0;
-}
-
-table.property-table th,
-table.property-table td {
-  padding: 4px 10px;
-}
-
 .sidebar-cheatsheets, .sidebar-donate {
   margin: 2.75rem 0;
 }