Remove unused hosts

Doing some cleanup and removing configuration and hosts that are no
longer part of the project.

grep has migrated to the k8s cluster, gh.metacpan.org isn't functional
and hasn't been for some time now. The other clusters are not running
containers.

inventories/production/hosts

@@ -7,29 +7,3 @@ lw-mc-03.metacpan.org
 bm-mc-01.metacpan.org
 bm-mc-02.metacpan.org
 bm-mc-04.metacpan.org
-
-[hivelocity]
-hc-mc-01.metacpan.org ansible_python_interpreter="/usr/bin/env python3"
-hc-mc-02.metacpan.org ansible_python_interpreter="/usr/bin/env python3"
-hc-mc-03.metacpan.org ansible_python_interpreter="/usr/bin/env python3"
-
-[container_hosts]
-lw-mc-01.metacpan.org
-lw-mc-02.metacpan.org
-hc-mc-01.metacpan.org ansible_python_interpreter="/usr/bin/env python3"
-hc-mc-02.metacpan.org ansible_python_interpreter="/usr/bin/env python3"
-hc-mc-03.metacpan.org ansible_python_interpreter="/usr/bin/env python3"
-
-[github-meets-cpan]
-lw-mc-02.metacpan.org
-
-[grep_metacpan]
-hc-mc-01.metacpan.org ansible_python_interpreter="/usr/bin/env python3"
-
-[hound_metacpan]
-hc-mc-01.metacpan.org ansible_python_interpreter="/usr/bin/env python3"
-hc-mc-02.metacpan.org ansible_python_interpreter="/usr/bin/env python3"
-
-[web_metacpan]
-hc-mc-01.metacpan.org ansible_python_interpreter="/usr/bin/env python3" metacpan_web_scale=2
-hc-mc-02.metacpan.org ansible_python_interpreter="/usr/bin/env python3" metacpan_web_scale=2