VASS-1358 anchor formatting bar to editor

https://workflow.ghx.com/browse/VASS-1345

In a previous MR (!29 (merged)) we moved the formatting bar to appear above the input. This is a problem when replying to comments because the formatting bar covers the comment being responded to.

This change moves the toolbar to appear in the editor.

To verify:

1. Clone this repo: https://gitlab.com/lumere-public/lumere-ui then switch to this branch
2. In newly cloned lumere-ui repo, run npm link
3. in phapp repo, run npm link @lumere/lumere-ui
4. Then run ls to verify it's correct: npm ls @lumere/lumere-ui
5. Restart server
6. Go to a project: http://localhost:8000/projects/app/#/28689/notes
7. Add a note and reply to a note

Expect: formatting bar appears inside editor.