host_vars: Remove apollo

Removed the host_vars file for apollo.

host_vars/apollo.archlinux.org

----
-hostname: "apollo"
-
-ipv4_address: "138.201.81.199"
-ipv4_netmask: "/32"
-ipv6_address: "2a01:4f8:172:1d86::1"
-ipv6_netmask: "/128"
-ipv4_gateway: "138.201.81.193"
-ipv6_gateway: "fe80::1"
-filesystem: btrfs
-system_disks:
-  - /dev/sda
-  - /dev/sdb
-
-kanboard_version: "v1.2.14"
-
-fail2ban_jails:
-  sshd: true
-  postfix: true
-  dovecot: false