feat: Sharing improvements (#1388)

* add migrations

* first pass at API

* feat: Updated share dialog UI

* tests

* test

* styling tweaks

* feat: Show share state on document

* fix: Allow publishing share links for draft docs

* test: shares.info

server/models/Event.js

@@ -80,6 +80,7 @@ Event.AUDIT_EVENTS = [
   "documents.move",
   "documents.delete",
   "shares.create",
+  "shares.update",
   "shares.revoke",
   "groups.create",
   "groups.update",