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

app/menus/DocumentMenu.js

@@ -110,8 +110,7 @@ class DocumentMenu extends React.Component<Props> {
 
   handleShareLink = async (ev: SyntheticEvent<>) => {
     const { document } = this.props;
-    if (!document.shareUrl) await document.share();
-
+    await document.share();
     this.props.ui.setActiveModal("document-share", { document });
   };