Current docs did not include information on configuring the app
in Crowd. Also, moved the doc to the new administration/auth
directory.

add an other ldap configuration example

See merge request !6773

Log LDAP blocking/unblocking events to application log

See merge request !8042

While not technically invalid, it is not necessary to have the 
`memberOf` OID in the `user_filter`. It clutters things up and causes
confusion for users so it's better if we remove it from the docs. 

A customer noted an error/lack of clarity in the LDAP documentation
with the `ldap_search` example. Previously, if taken literally, the
customer may have expected the `$` variables to be automatically
replaced or if they paste the exact `user_filter` contents the
parentheses would have been incorrect. Let's just simply the filter
and use exactly what's in the configuration.