Fix banner icons (#220)

* fix: remove banner icons

* bump namspace.js version back to dev

Author: echarles

nbclassic/static/base/js/namespace.js

@@ -73,7 +73,7 @@ define(function(){
     // tree
     jglobal('SessionList','tree/js/sessionlist');
 
-    Jupyter.version = "0.5.2";
+    Jupyter.version = "0.6.0.dev0";
     Jupyter._target = '_blank';
 
     return Jupyter;

nbclassic/templates/page.html

@@ -144,13 +144,12 @@
           <span class="label label-warning">UPDATE</span>
           Read <a href="https://jupyter-notebook.readthedocs.io/en/latest/migrate_to_notebook7.html" style="text-decoration: underline;" target="_blank">the migration plan</a> to Notebook 7 to learn about the new features and the actions to take if you are using extensions
           -
-          <span class="glyphicon glyphicon-exclamation-sign" aria-hidden="true"></span>
           Please note that updating to Notebook 7 might break some of your extensions.
         </div>
         <div style="margin-left: auto;">
           <a href="" onclick="alert('This message will not be shown anymore.'); return false;">
             <button type="button" class="btn btn-default btn-xs" id="dontShowId">
-              <span class="glyphicon glyphicon-remove" aria-hidden="true"></span> Don't show anymore
+              Don't show anymore
             </button>          
           </a>
         </div>