Added note about incomplete documentation

This adds two notes, one pointing to the old documentation and the other
pointing to the community, for getting extra help if their question is
not answered.

Author: kevin-brown

docs/_includes/options-new/introduction.html

@@ -1,5 +1,9 @@
 <section>
+  <div class="alert alert-warning">
+    This page of the documentation is currently <strong>undergoing a rewrite and may be incomplete</strong>. If you do not find the answer you are looking for on this page, you may have better luck looking at <a href="options-old.html">the old options page</a>.
+  </div>
+
   <p>
-    This documentation is set up in the form of a FAQ.
+    This documentation is set up in the form of a FAQ and covers the most common questions. If you do not find the answer to your question here, you may want to <a href="community.html">reach out to the community</a> to see if someone else can answer it.
   </p>
 </section>