Fix dokuwiki role clobbering existing installs

WHOOPS THAT'S KINDA BAD OH FUCK

roles/dokuwiki/tasks/main.yml

@@ -13,7 +13,7 @@
           state: directory
       - name: Check for existing installation
         stat:
-          path: "{{ dokuwiki_webroot }}/index.html"
+          path: "{{ dokuwiki_webroot }}/index.php"
         register: stat_webroot_index
       - name: Install Dokuwiki
         block:
@@ -27,13 +27,6 @@
               remote_src: yes
               dest: "{{ dokuwiki_webroot }}"
               extra_opts: [--strip-components=1]
-          - name: Create data directory
-            file:
-              path: "/var/dokuwiki"
-              state: directory
-              mode: 0700
-              owner: www-data
-              group: www-data
           - name: Chown webroot
             file:
               path: "{{ dokuwiki_webroot }}"