remove on-page copyright statement
remove on-page copyright statement

this stems back to the old, html-only, doc. We now have it in
the framework.

qha/rsyslog-doc,qha/rsyslog-doc,qha/rsyslog-doc,sematext/rsyslog-doc,sematext/rsyslog-doc,sematext/rsyslog-doc,janmejay/rsyslog-doc,janmejay/rsyslog-doc,qha/rsyslog-doc,janmejay/rsyslog-doc,janmejay/rsyslog-doc,sematext/rsyslog-doc