Help text for web-based configuration editor

[philipabbey]

Needs to cover:

1. Can retrieve menu from URL, but can't publish back. Need to copy & paste. We have a copy button for that.
2. CTRL+Space to get a list of autocomplete strings
3. JSON schema vs entity names
4. Works in templates too, based on text before cursor
5. In templates, CTRL+Space then CTRL+Space again adds the HA entity name to provide the familiar name
6. Can render templates locally for testing string format

Any screenshots (sanitised)?

Links to resources:

• Jinja2
• Templating in HA