Disable updating/deleting group posts and discussions for non-moderators

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

js/src/views/Posts/List.vue

@@ -157,6 +157,10 @@ export default class PostList extends Vue {
 }
 </script>
 <style lang="scss" scoped>
+.container.section {
+  background: $white;
+}
+
 section {
   div.intro,
   .post-list {