Add contact section

frontend/template.html

@@ -33,6 +33,13 @@
 
 <p>To delete a file from the cache, just request the file via HTTP <code>DELETE</code></p>
 
+<h2>Contact</h2>
+
+<p>
+If you want to contact me, you can do so <a href="mailto:mail+yagcdn@vbrandl.net">via mail</a>. Feature requests can be
+made <a href="https://github.com/vbrandl/yagcdn/issues">GitHub issue</a>.
+</p>
+
 </article>
 
 <footer>