Maintenance: Drop obsolete file Procfile.frontend.
Maintenance: Drop obsolete file Procfile.frontend.

zammad/zammad,zammad/zammad,monotek/zammad,zammad/zammad,zammad/zammad,monotek/zammad,monotek/zammad,monotek/zammad,monotek/zammad,zammad/zammad,monotek/zammad,zammad/zammad