some ui fix

templates/repo/hooks_add.tmpl

@@ -45,6 +45,10 @@
                         </label>
                         <p class="help-block">We will deliver event details when this hook is triggered.</p>
                     </div>
+                    <hr/>
+                    <div class="form-group">
+                        <button class="btn btn-success">Add Webhook</button>
+                    </div>
                 </form>
             </div>
             <div class="panel-footer">