Merge branch 'sidebar-menu-align' into 'develop'

Align items in sidebar menus

See merge request soapbox-pub/soapbox-fe!561

app/styles/components/sidebar-menu.scss

@@ -168,7 +168,9 @@
   }
 
   .fa {
+    width: 18px;
     margin-right: 10px;
+    text-align: center;
   }
 
   &:hover {