Fix menu and inline code styling

Author: rozza

docs/reference/themes/mongodb/static/css/overrides.css

@@ -49,6 +49,10 @@
   display: block;
 }
 
+.sidebar-menu ul ul {
+  margin: 0;
+}
+
 .right-column .toc {
   display: none;
   padding: 12px 20px;
@@ -71,3 +75,8 @@
   font-weight: 800;
   text-transform: uppercase;
 }
+
+code {
+  background-color: #ddd;
+  color: #494747;
+}