place carbon ads in docs (#3296)

* place carbon ads in docs

* fix lint

* keep 4 space tabs

docs/overrides/main.html

@@ -0,0 +1,9 @@
+{% extends "base.html" %}
+
+{% block content %}
+  {% include "partials/content.html" %}
+  <hr/>
+  <div style="margin: 0 auto; max-width: 400px; margin-top: 40px;">
+    <script async type="text/javascript" src="//cdn.carbonads.com/carbon.js?serve=CWYIL2JU&placement=gethomepagedev&format=cover" id="_carbonads_js"></script>
+  </div>
+{% endblock %}

docs/stylesheets/extra.css

@@ -22,3 +22,11 @@
 #glimeRoot * {
     font-family: var(--md-text-font) !important;
 }
+
+#carbon-responsive {
+    --carbon-padding: 1em;
+    --carbon-max-char: 20ch;
+    --carbon-bg-primary: var(--md-default-bg-color) !important;
+    --carbon-bg-secondary: var(--md-default-fg-color--lightest) !important;
+    --carbon-text-color: var(--md-typeset-color) !important;
+}

mkdocs.yml

@@ -166,6 +166,7 @@ nav:
 
 theme:
   name: material
+  custom_dir: docs/overrides
   language: en
   palette:
       - media: "(prefers-color-scheme)"