Add awesome-panel-cli docs

[Marc Skov Madsen]

I would like to have docs available on read the docs to help users of this package.

Accept Criteria

• [] Sphinx Docs
• [] Furo theme
• [] Basic docs files written
• [] Docs deployed to read the docs
• [] The relevant sphinx commands added to the awesome-panel-cli
• [] docs folder added to project template
• [] General concept for docs as commands in the awesome-panel-cli, for example pn docs build, pn docs rebuild, pn docs serve.
• [] General concept for testing docs added as pn test docs or similar.
• [] Automated testing of docs added to github actions.