feat: Nested document sharing (#2075)

* migration

* frontend routing, api permissioning

* feat: apiVersion=2

* feat: re-writing document links to point to share

* poc nested documents on share links

* fix: nested shareId permissions

* ui and language tweaks, comments

* breadcrumbs

* Add icons to reference list items

* refactor: Breadcrumb component

* tweaks

* Add shared parent note

app/models/Share.js

@@ -10,6 +10,7 @@ class Share extends BaseModel {
   documentTitle: string;
   documentUrl: string;
   lastAccessedAt: ?string;
+  includeChildDocuments: boolean;
   createdBy: User;
   createdAt: string;
   updatedAt: string;