Remove arch32 mirror role

We no longer mirror arch32 on our servers and this role is currently broken.

playbooks/mirrors.yml

@@ -11,7 +11,6 @@
     - { role: nginx }
     - { role: syncrepo, tags: ['nginx'] }
     - { role: archweb, archweb_site: false, archweb_services: false, archweb_mirrorcheck: true }
-    - { role: arch32_mirror, tags: ['nginx'] }
     - { role: prometheus_exporters }
     - { role: promtail }
     - { role: fail2ban }