playbooks/aur: Rename the aur playbook file and add the missing roles

The original aur playbook file was missing a lot of the roles that were
added for the aur-dev playbook. Add them and renamed the file too.

playbooks/aur.archlinux.org.yml

+---
+
+- name: setup aur.archlinux.org
+  hosts: aur.archlinux.org
+  remote_user: root
+  roles:
+    - { role: common }
+    - { role: tools }
+    - { role: sshd }
+    - { role: root_ssh }
+    - { role: certbot }
+    - { role: nginx }
+    - { role: mariadb, mariadb_innodb_buffer_pool_size: '64M', mariadb_table_open_cache: '256', mariadb_query_cache_type: '0',
+              mariadb_innodb_file_per_table: True }
+    - { role: sudo }
+    - { role: php-fpm, php_extensions: ['apc', 'apcu', 'iconv', 'mysqli', 'pdo_mysql'], zend_extensions: ['opcache'], tags: ["php-fpm"] }
+    - { role: uwsgi, tags: ["uwsgi"] }
+    - { role: borg-client, tags: ["borg"] }
+    - { role: postfix, tags: ["postfix"], postfix_relayhost: "orion.archlinux.org" }
+    - { role: fail2ban, tags: ["fail2ban"] }
+    - { role: aurweb, tags: ["aurweb"] }