Make the pad types displayed on the front page configurable

customize.dist/index.html

@@ -82,6 +82,7 @@
           <a id="create-pad" class="button create" href="/pad/">CREATE NEW WYSIWYG PAD</a>
           <a id="create-code" class="button create" href="/code/">CREATE NEW CODE PAD</a>
           <a id="create-poll" class="button create" href="/poll/">CREATE NEW POLL</a>
+          <a id="create-slide" class="button create" href="/slide/">CREATE NEW PRESENTATION</a>
         </div>
       </center>