Fixes #135: Add button to toggle navbar on small screens

netbox/templates/_base.html

@@ -13,6 +13,12 @@
     <nav class="navbar navbar-default navbar-fixed-top">
         <div class="container">
             <div class="navbar-header">
+                <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar" aria-expanded="false">
+                    <span class="sr-only">Toggle navigation</span>
+                    <span class="icon-bar"></span>
+                    <span class="icon-bar"></span>
+                    <span class="icon-bar"></span>
+                </button>
                 <a class="navbar-brand" href="/">NetBox</a>
             </div>
             <div id="navbar" class="navbar-collapse collapse">