feat: Show diff when navigating revision history (#4069)

* tidy

* Add title to HTML export

* fix: Add compatability for documents without collab state

* Add HTML download option to UI

* docs

* fix nodes that required document to render

* Refactor to allow for styling of HTML export

* div>article for easier programatic content extraction

* Allow DocumentHelper to be used with Revisions

* Add revisions.diff endpoint, first version

* Allow arbitrary revisions to be compared

* test

* HTML driven revision viewer

* fix: Dark mode styles for document diffs

* Add revision restore button to header

* test

* Support RTL languages in revision history viewer

* fix: RTL support
Remove unneccessary API requests

* Prefetch revision data

* Animate history sidebar

* fix: Cannot toggle history from timestamp
fix: Animation on each revision click

* Clarify currently editing history item

package.json

@@ -137,6 +137,7 @@
     "mobx-react": "^6.3.1",
     "natural-sort": "^1.0.0",
     "node-fetch": "2.6.7",
+    "node-htmldiff": "^0.9.4",
     "nodemailer": "^6.6.1",
     "outline-icons": "^1.45.1",
     "oy-vey": "^0.11.2",