Merge branch 'fix_safari_sidebar_menu_rendering' into 'develop'

Fix sidebar menu rendering to work in iOS Safari and other browsers. Fixes #105 #421

Closes #421 and #105

See merge request soapbox-pub/soapbox-fe!74

app/styles/components/sidebar-menu.scss

@@ -3,7 +3,6 @@
   position: fixed;
   flex-direction: column;
   width: 275px;
-  height: 100vh;
   top: 0;
   bottom: 0;
   left: 0;
@@ -30,12 +29,10 @@
   }
 
   &__content {
-    display: flex;
-    flex: 1 1;
-    flex-direction: column;
-    padding-bottom: 40px;
     overflow-y: scroll;
-    -webkit-overflow-scrolling: touch;
+    overflow: auto;
+    height: 100%;
+    width: 100%;
   }
 
   &__section {