fix gallery.html Features

gallery.html

@@ -56,10 +56,10 @@
               <a class="nav-link" href="https://tamlok.github.io/vnote">Home</a>
             </li>
             <li class="nav-item">
-              <a class="nav-link" href="#features">Features</a>
+              <a class="nav-link" href="index.html#features">Features</a>
             </li>
             <li class="nav-item">
-                <a class="nav-link" href="gallery.html">Screenshots <span class="sr-only">(current)</span></a>
+                <a class="nav-link" href="">Screenshots <span class="sr-only">(current)</span></a>
             </li>
             <li class="nav-item">
               <a class="nav-link" href="http://vnote.readthedocs.io">Documentation</a>