In regards to manage_hypervisor_config.sh, it should:

• execute start_webserver.sh 
• absorb cleanup_hypervisor.sh

For the new manage_composer_config.sh, it should:

• absorb cleanup_composer.sh
• absorb start_osbuild_workers.sh
• execute start_webserver.sh 
• similar to manage_hypervisor_config.sh it should have two commands: create and cleanup

Additionally we want to change ci_phase*.sh files so they use newly created/updated scripts (and e.g. stop using start_webserver.sh because it'll be executed by another file).

Following files look unused, so we can remove them:

• rebuild_source_images.sh

We also need to update docs