prosemirror

follow-on from #179

Description

• Fix auto deploys for the 0.x branch.
• Fix build, lint and type check for 0.x branch.

Context

Following the #614 fix which hasn't yet been deployed, I need to set up automatic deployments for this branch.

Collecting scenarios that would be good to have them covered in cypress tests:

• Rich workspace properly shows when
  • Loading the files app
  • Changing directory
  • Hidden if switching to other file list

ProseMirror (and by extension, prosemirror-math) relies on contenteditable to function. Since the implementation of contenteditable is not yet standardized between browsers, we must test manually in each browser to ensure acceptable behavior.

I do not own a Mac, so I cannot test prosemirror-math on Safari. Please report any bugs you find in Safari!