refactor ♻️: Refactor README and update role for Proxmox VE provisioning

This refactoring includes updating the README, changing the role name to focus on Proxmox VE, enhancing compatibility matrix, and refactoring default values for role variables. Handlers are updated to manage apt cache, restart pveproxy, and reload systemd. Role metadata is also updated for better Proxmox VE provisioning.

meta/main.yml

@@ -1,18 +1,15 @@
 ---
-# ansible-role-template/meta/main.yml
+# ansible_role_proxmox_provision/meta/main.yml
 galaxy_info:
-  role_name: ansible_role_template  # if absent directory name hosting role is used instead
+  role_name: ansible_role_proxmox_provision
   namespace: joseraj  # if absent, author is used instead
   author: joseraj
-  description: >
-    A reusable Ansible role template for deploying and managing applications/services
-    with security best practices, modularity, and idempotency.
+  description: Proxmox VE tuning (repos, nag removal, swap, logrotate, powertop)
   license: MIT
   min_ansible_version: "2.12"
   platforms:
     - name: Debian
       versions:
-        - buster
         - bullseye
         - bookworm
         - trixie