userportal, webadmin: remove unnecessary DocsURL config

Removed the DocsURL config parameter and the logic around
refreshing it and calculating whether the documentation
is available. Simply hardcoding to "/docs" now.

Change-Id: I4e6dec7c400778a27b225a9416cb504235576901
Bug-Url: https://bugzilla.redhat.com/987862
Signed-off-by: Greg Sheremeta <gshereme@redhat.com>