archwiki: clean up old task

roles/archwiki/tasks/main.yml

@@ -42,9 +42,6 @@
   when: maintenance is not defined
   tags: ['nginx']
 
-- name: remove old fastcgi cache directory
-  file: path=/etc/nginx/wikicache state=absent
-
 - name: configure robots.txt
   copy: src=robots.txt dest="{{ archwiki_dir }}/robots.txt" owner=root group=root mode=0644