Gogs is the origin for common git forges so we add a documentation which
may be beneficial for other use cases where lldap should be used with.
It appears to be in mantenance mode - the current example may have to be
extended in the future.
We adapt the official documentation example configuration to integrate
lldap with the more elaborated example.
The reader may also be interested in a more simple example at
[upstream](https://github.com/gogs/gogs/blob/main/conf/auth.d/ldap_simple_auth.conf.example).