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

package.json

@@ -84,7 +84,7 @@
     "@reach/tooltip": "^0.16.2",
     "@standardnotes/components": "1.4.4",
     "@standardnotes/features": "1.26.1",
-    "@standardnotes/snjs": "2.45.0",
+    "@standardnotes/snjs": "2.46.0",
     "@standardnotes/settings": "^1.10.0",
     "@standardnotes/sncrypto-web": "1.6.0",
     "mobx": "^6.3.5",