Refactor: Organize Ansible project structure

- Reorganized Ansible project structure to follow best practices.
- Created dedicated directories: , , , , and .
- Categorized playbooks into  (host-specific) and  (service-specific).
- Moved all roles into the  directory and standardized their naming conventions.
- Relocated  to  for better variable management.
- Renamed  to  to reflect its global variable scope.
- Created  to correctly set the  to the new  directory.
- Moved  and  into the  directory.
- Added  to  providing explanations for common commands.
- Cleaned up  directories from all individual roles to centralize version control.

roles/security/tasks/autoupdate-Debian.yml

@@ -0,0 +1,16 @@
+---
+- name: Install unattended upgrades package.
+  package:
+    name: unattended-upgrades
+    state: present
+
+- name: Copy unattended-upgrades configuration files in place.
+  template:
+    src: "{{ item }}.j2"
+    dest: "/etc/apt/apt.conf.d/{{ item }}"
+    owner: root
+    group: root
+    mode: 0644
+  with_items:
+    - 10periodic
+    - 50unattended-upgrades