Most of the definitions are based on the documentation in
`internal/manager/config/config.go` or inferred by labels and
descriptions from Flamenco v2 config pages.
Reviewed-on: https://projects.blender.org/studio/flamenco/pulls/104400
Sometimes the setup assistant doesn't work (port already in use, Blender
not installed), so having an example file will make it possible to still
start Flamenco.
