Add default content for the index page.

Author: davorg

share/site_src/index.html.tt

@@ -1,2 +1,5 @@
-<h1>Distribution name: [% distribution.name %]</h1>
-<p>Current release: <a href="https://metacpan.org/release/[% distribution.name %]">[% release.name %]</a></p>
+<h1>[% distribution.name %]</h1>
+<p>[% release.abstract %]</p>
+<p>Current version: [% release.version %]</p>
+
+[% INCLUDE intro.tt %]

share/tt_lib/intro.tt

@@ -0,0 +1,8 @@
+<div style="border: red 2px solid; padding: 0.5em">
+<p>This is the default content for a web site that is generated by
+<a href="https://davorg.dev/app-cpanmodulesite">App::CPANModuleSite</a>.</p>
+
+<p>If this is your site and you want to change this into more interesting
+content, create a file called <tt>tt_lib/intro.tt</tt> in your module's
+repository and regenerate this site (by running <tt>mksite</tt>).</p>
+</div>