info: Revise the output
info: Revise the output

Show a description and show the appstream version,
and tidy up the formatting.

This gets us closer to the design in
https://github.com/flatpak/flatpak/wiki/CLI-experimental-design

Closes: #2409
Approved by: alexlarsson

matthiasclasen/flatpak,matthiasclasen/flatpak,matthiasclasen/flatpak,flatpak/flatpak,flatpak/flatpak,matthiasclasen/flatpak,flatpak/flatpak,matthiasclasen/flatpak,flatpak/flatpak,flatpak/flatpak