* Add a first description of the config options for csaf_provider.
* Change option name from `domain` to `canonical_prefix_url`
to make the usage more intuitively. Use`https` in the default,
if unset.
resolve #32
Co-authored-by: Bernhard E. Reiter <bernhard@intevation.de>
Co-authored-by: tschmidtb51 <65305130+tschmidtb51@users.noreply.github.com>