Revert unrelated changes

- @roschaefer, I reverted the changes you made that were unrelated to
the server-side rendering issue with the editor... maybe we can put in a
separate PR with them, or a subset of them that doesn't remove the
reactivity of the editor placholder(?)

webapp/components/Editor/Editor.vue

@@ -129,7 +129,7 @@ export default {
       },
     },
   },
-  created() {
+  mounted() {
     this.editor = new Editor({
       content: this.value || '',
       doc: this.doc,