[REF] portal: remove BS3 hacks which are not needed anymore

addons/portal/static/src/scss/portal.scss

@@ -119,13 +119,9 @@ hr {
 }
 
 // Bootstrap hacks
-.container {
-    max-width: 100%;
-}
 .container .container {
     padding-left: 0;
     padding-right: 0;
-    width: auto;
 }
 [class^="col-md-"] {
     min-height: 24px;