Plaintext / code editor

[tcr]

edit-text is not going to be preferable over a CRDT-based implementation like Atom's Teletype, but it is still a useful proof-of-concept to see:

1. Can edit-text be stripped of its rich text elements (headings, bold text, etc.) and made into a plain-text editor,
2. Can the design of the site be changed to be more like a code editor,
3. and is this a mode that can be optionally enabled on a per-document basis?

Would be interesting to write a Markdown document in rich text, convert it to Markdown mode, make edits, then convert back.