feat: add migration pref pane (#825)

* feat: add migration pane

* style: clean imports

* removeme: beta version

* fix: do no show dropzone when tag has no parent

* fix: hide the Folders toggle

* fix: hide migrations option when user has no folders

* fix: add delimiter on Folders mark

* removeme: bump beta

* fix: remove component viewer for tag folders

* removeme: bump beta

* chore(deps): snjs

app/assets/javascripts/preferences/components/MenuItem.tsx

@@ -16,7 +16,9 @@ export const MenuItem: FunctionComponent<Props> = ({
   onClick,
 }) => (
   <div
-    className={`preferences-menu-item select-none ${selected ? 'selected' : ''}`}
+    className={`preferences-menu-item select-none ${
+      selected ? 'selected' : ''
+    }`}
     onClick={(e) => {
       e.preventDefault();
       onClick();