doc: remove not-intended-for-docset pages

These pages were originally written as website-exclusive content and
include google ads. They were accidently copied into the rsyslog doc.

Thanks to Tomas Heinrich for alerting us.
prepare for 7.4.8 release
Merge branch 'v7-stable' into v7-devel

Conflicts:
	ChangeLog
	configure.ac
	doc/manual.html
add forgotten files
doc: adjust release date