Generate favicon from post

templates/pages/settings.html

@@ -24,6 +24,10 @@
           <label>Base URL</label>
           <input name="base_url" type="text" value="{{ base_url }}" />
         </div>
+        <div>
+          <label>Favicon post ID</label>
+          <input name="favicon_post_id" type="text" pattern="[0-9]*" />
+        </div>
         <div>
           <label>Ask for age confirmation?</label>
           <input