Caddy usually expects just a hostname without scheme to do its automatic
HTTPS. It is possible to get the old behavior (only HTTP) by setting
`services.caddy.virtualHosts.<host>.hostName`.
Added the RFC42-style added the posibility to use
`services.dokuwiki.sites.<name>.settings' instead of passing a plain
string to `<name>.extraConfig`. ´<name>.pluginsConfig` now also accepts
structured configuration.
Also added two "quality of life" tests to ensure customisations to the
dokuiwki package are not being discarded and both webserver
configurations handle rewriting correctly.
Cookie jar can be used to accurately test if the login was successful.
Simply searching for the user name is not sufficient, since it is always
part of the returned page after login. The page should display a phrase
containing the username after login.
Enables multi-site configurations.
This break compatibility with prior configurations that expect options
for a single dokuwiki instance in `services.dokuwiki`.
