roles: Remove mentions of Piwik

I never check the damn analytics stats and the database is huge.

roles/mariadb/defaults/main.yml

@@ -2,7 +2,6 @@
 # file: roles/mariadb/defaults/main.yml
 #
 # Based on my running of mysqltuner.pl on a host with three WordPress databases
-# and a Piwik instance monitoring three sites.
 #
 
 # default is 128MB but is a waste because it seems only the mysql table uses it

roles/php-fpm/tasks/Debian_10.yml

@@ -9,9 +9,6 @@
         - php-mysql
         - php-gd
         - php-curl
-        # for Piwik
-        - php-mbstring
-        - php-xml
 
   - name: Install php-fpm and deps
     apt: name={{ php_fpm_packages }} state=present update_cache=yes

roles/php-fpm/tasks/Ubuntu_18.04.yml

@@ -9,9 +9,6 @@
         - php-mysql
         - php-gd
         - php-curl
-        # for Piwik
-        - php-mbstring
-        - php-xml
 
   - name: Install php-fpm and deps
     apt: name={{ php_fpm_packages }} state=present update_cache=yes

roles/php-fpm/tasks/Ubuntu_20.04.yml

@@ -9,9 +9,6 @@
         - php-mysql
         - php-gd
         - php-curl
-        # for Piwik
-        - php-mbstring
-        - php-xml
 
   - name: Install php-fpm and deps
     apt: name={{ php_fpm_packages }} state=present update_cache=yes