Replaced Bootstrap alert with Material Design snackbar

src/web/html/index.html

@@ -146,10 +146,6 @@
         <button type="button" class="btn btn-warning bmd-btn-icon" id="edit-favourites" data-toggle="tooltip" title="Edit favourites">
             <i class="material-icons">star</i>
         </button>
-        <div id="alert" class="alert alert-danger">
-            <button type="button" class="close" id="alert-close">&times;</button>
-            <span id="alert-content"></span>
-        </div>
         <div id="content-wrapper">
             <div id="banner" class="row">
                 <div class="col" style="text-align: left; padding-left: 10px;">