Put glossary ref on HomePage.pod6 (#4178)

Author: 0rir

doc/HomePage.pod6

@@ -40,6 +40,9 @@ navigation.
 <dd>
     A collection of questions that have cropped up often, along with answers.
 </dd>
+<dt><a href="/language/glossary">Glossary</a></dt>
+    Definitions of some words related to Raku.
+<dd>
 <dt><a href="/language/community">Community</a></dt>
 <dd>
     Information about the Raku development community, email lists, IRC and IRC bots, and blogs