Phriction - move delete to modern editor + transactions

Summary:
Ref T4029. Much like D10756 this does the bare minimum to get things in there. I have a sticky with "TODOs" about moving the error-checking business logic into the editor in both cases.

Up next - move actions...

Test Plan: deleted a document and it worked! verified proper feed story.

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: shadowhand, Korvin, epriestley

Maniphest Tasks: T4029

Differential Revision: https://secure.phabricator.com/D10761