* Revert "Revert "Use %mention to embed a contract card in rich text editor (#869)""
This reverts commit e0634cea6d.
* Overwrite name to prevent breakages
* Fix '%' mentioning if you escape out
* Cleanup: merge render functions
* Add @ mentions to editor
* Fix mention list not loading
* Sort mention list by prefix, follow count
* Render at mention with Linkify component
- mentions are now Next <Link> rather than <a>
- fix bug where editor.getText() returns [object Object] for mentions
- fix mention rendering for posted markets