roles/nextcloud: Switch to Fedora package

Fedora now includes a packaged version of Nextcloud.  This will be
_much_ easier to maintain than the tarball-based distribution method.
There are some minor differences in how the Fedora package works,
compared to the upstream tarball.  Notably, it puts the configuration
file in `/etc/` and makes it read-only, and it stores persistent data
separate from the application.  These differences require modifications
to the Apache and PHP-FPM configuration, but the package also included
examples to make this easier.  Since the `config.php` is read-only now,
it has to be managed by the configuration policy; it cannot be modified
by the Administration web UI.

roles/nextcloud/handlers/main.yml

@@ -1,3 +1,7 @@
+- name: restart php-fpm
+  service:
+    name: php-fpm
+    state: restarted
 - name: reload httpd
   service:
     name: httpd