Fix: Resolved Discourse plugin bug and unified variable/path handling

- Discourse: fixed 'DISCOURSE_CONTAINERS_DIR' and 'DISCOURSE_APPLICATION_YML_DEST'
- Nextcloud: improved plugin enable/configure tasks formatting
- WordPress: unified OIDC, msmtp, and upload.ini variables and tasks
- General: aligned spacing and switched to path_join for consistency

roles/web-app-wordpress/tasks/03_enable_plugin.yml

@@ -1,8 +1,10 @@
 ---
-- name: "Check if plugin has a dedicated install task"
+- name: "Check if plugin has a dedicated install task under '{{ plugin_task_path }}'"
   stat:
     path: "{{ plugin_task_path }}"
   register: plugin_task_file
+  delegate_to: localhost
+  become: false
 
 - name: "Include plugin-specific install task if it exists"
   include_tasks: "{{ plugin_task_path }}"