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/prometheus_node_exporter/handlers/main.yml

@@ -0,0 +1,9 @@
+---
+- name: daemon reload
+  systemd:
+    daemon_reload: yes
+
+- name: start node_exporter
+  service:
+    name: node_exporter
+    state: started

roles/prometheus_node_exporter/tasks/main.yml

@@ -0,0 +1,12 @@
+---
+- name: Install prometheus-node-exporter
+  apt:
+    name: prometheus-node-exporter
+    state: present
+    update_cache: yes
+
+- name: Check if prometheus-node-exporter service is running
+  service:
+    name: prometheus-node-exporter
+    state: started
+    enabled: yes