Adjust header to match website

fixes #86

_shared_assets/themes/nextcloud_com/layout.html

@@ -67,11 +67,14 @@
 
     <nav class="collapse navbar-collapse" role="navigation">
       <ul id="menu-header" class="nav navbar-nav">
+          <li><a target="_blank" href="https://demo.nextcloud.com">Demo</a></li>
           <li><a href="https://nextcloud.com/news/">News</a></li>
+          <li><a href="https://nextcloud.com/features/">Features</a></li>
           <li><a href="https://nextcloud.com/about/">About us</a></li>
           <li><a href="https://nextcloud.com/contribute/">Get involved</a></li>
           <li><a href="https://nextcloud.com/support/">Support</a></li>
           <li><a href="https://nextcloud.com/enterprise/">Enterprise</a></li>
+          <li class="menu-install"><a href="https://nextcloud.com/install/">Download</a></li>
       </ul>
     </nav>
   </div>

_shared_assets/themes/nextcloud_com/static/styles.css

@@ -7,15 +7,6 @@
 	border-color: red;
  }*/
 
-.menu-install {
-    background: #35537a !important;
-}
-
-.menu-install:hover  {
-    background: #2A6496 !important;
-}
-
-
 @font-face {
     font-family: 'Open Sans';
     font-style: normal;