Make the side bar about in-document navigation by removing the duplicated h1

Docker-DCO-1.1-Signed-off-by: Sven Dowideit <SvenDowideit@docker.com> (github: SvenDowideit)
Upstream-commit: 1f25bfea2ddbfa5c41ab3f0cd0716229833ebac1
Component: engine

components/engine/docs/theme/mkdocs/css/docs.css

@@ -328,4 +328,10 @@ ol li {
 }
 table.table tr td img {
     width:100%;
-}
+}
+#versionnav ul {
+    list-style: none outside none;
+}
+#versionnav ul ul {
+    padding: 0;
+}