Proto FAQ

This is not the FAQ

This isn't the Textual FAQ, but it is where we'll collect information and ideas and points before they make it into [the official docs](https://textual.textualize.io/, either as enhancements to some information in the docs, or as an actual FAQ.

Note: when things are added to the official docs/FAQ, they will be removed from here. Don't look here, look in the docs! (a link to the FAQ will appear here once one is started)

The demo/examples/my app doesn't look great

Document the minimal requirements for terminals, also mention useful settings for TERM (set to xterm-256color, etc) and COLORTERM (set to truecolor, etc).