feat(3p/cgit): Highlight cheddar callout in about views

Change-Id: Ica055ab621608ff78dbbf9ea9a2c9d1cdf2ff21e
Reviewed-on: https://cl.tvl.fyi/c/depot/+/3556
Tested-by: BuildkiteCI
Reviewed-by: sterni <sternenseemann@systemli.org>

third_party/cgit/tvl-extra.css

@@ -2,3 +2,29 @@
 .content #summary {
   max-width: 800px;
 }
+
+/* highlight cheddar callouts in cgit about views */
+.cheddar-callout {
+    display: block;
+    padding: 10px;
+}
+
+.cheddar-question {
+    color: #3367d6;
+    background-color: #e8f0fe;
+}
+
+.cheddar-todo {
+    color: #616161;
+    background-color: #eeeeee;
+}
+
+.cheddar-tip {
+    color: #00796b;
+    background-color: #e0f2f1;
+}
+
+.cheddar-warning {
+    color: #a52714;
+    background-color: #fbe9e7;
+}