roles/archwiki: Initial handlers commit

Add a handlers entry for reloading systemd and restarting the php-fpm
unit.

roles/archwiki/handlers/main.yml

+---
+
+- name: daemon reload
+  command: systemctl daemon-reload
+
+- name: restart php-fpm@archwiki
+  service: name=php-fpm@{{ archwiki_user }} state=restarted