Updated Help pages to include Hubzilla on OpenShift

Created by: HaakonME

Updated admin.bb with a link to new help page Hubzilla_on_OpenShift.bb and fixed some types in .openshift/README.md

Note: after submitting this pull request, I noticed had forgotten to describe myisamchk should be used with mysqld stopped, whilst mysqlcheck needs mysqld running to do checks and repairs, and I have added a short note about this at the bottom of the help page.