Offliner documentation references now invalid URL

Offliner documentation[1] references an invalid URL[2] and should be updated to the new URL[3]. Since this broadly affects previous documentation and other products I created a bug[4].

[1] https://access.redhat.com/documentation/en-us/red_hat_process_automation_manager/7.6/html/installing_and_configuring_red_hat_process_automation_manager_on_red_hat_jboss_eap_7.2/maven-repo-using-con
[2] http://release-engineering.github.io/offliner/
[3] https://commonjava.github.io/offliner/
[4] https://github.com/Commonjava/offliner/issues/54