config: fix contentui css

The extension CSS does not get included correctly. Fix html context so we don't have to copy the css.

doc/common/_static/css/theme_overrides.css

@@ -25,56 +25,3 @@ span.caption-number:after {
     font-family: "Roboto Slab","ff-tisa-web-pro","Georgia",Arial,sans-serif;
     margin-bottom: 24px !important;
 }
-
-/* The following CSS from https://github.com/ulrobix/sphinxcontrib-contentui
-   which is available under the MIT License.
-*/
-
-ul.contenttab-selector {
-    display:block;
-    list-style-type: none;
-    margin: 0 0 10px;
-    padding: 0;
-    line-height: normal;
-    overflow: auto;
-}
-ul.contenttab-selector li {
-    display: block;
-    cursor: pointer;
-    font-weight: bold;
-    margin: 0 5px 0 0;
-    padding: 5px 10px;
-    float: left;
-    background-color: #999;
-    color: #fff;
-    -moz-border-radius: 5px;
-    -webkit-border-radius: 5px;
-    border-radius: 5px;
-    -khtml-border-radius: 5px;
-}
-.rst-content .section ul.contenttab-selector,
-.rst-content .toctree-wrapper ul.contenttab-selector,
-article ul.contenttab-selector{
-    line-height: normal;
-    margin: 0 0 10px;
-}
-.rst-content .section ul.contenttab-selector li,
-.rst-content .toctree-wrapper ul.contenttab-selector li,
-article ul.contenttab-selector li{
-    margin-left: 0;
-}
-ul.contenttab-selector li:hover {
-    background-color: #777;
-}
-ul.contenttab-selector li.selected {
-    background-color: #2980b9;
-}
-ul.contenttab-selector li.selected:hover {
-    background-color: #333;
-}
-.content-tabs {
-    margin: 10px 0 20px 0;
-}
-.tab-content {
-    clear: both;
-}

doc/common/conf.py

@@ -123,6 +123,7 @@ else:
     html_context = {
         'css_files': [
             '_static/css/theme_overrides.css',
+            '_static/contentui.css',
         ],
         'disclaimer': _DISCLAIMER,
     }