removed .f-col helpers from nav and main

vue-theme/src/app.vue

@@ -1,8 +1,8 @@
 <template lang="pug">
 #theme.f-col
-    cia-nav.f-col
+    cia-nav
     cia-hero
-    main.f-col
+    main
         router-view
     cia-footer
 </template>