docs: rewrite README with structured overview and quick start guide

Replaces the minimal project description with a comprehensive README
including a component overview table, quick start instructions, common
Ansible operations, and links to detailed documentation. Aligns with
Red Panda Approval™ standards.

ansible/apt_update.yml

@@ -0,0 +1,11 @@
+---
+- name: Update Ubuntu packages
+  hosts: ubuntu
+  become: true
+
+  tasks:
+    - name: Update all packages to the latest version
+      ansible.builtin.apt:
+        name: "*"
+        state: latest
+        update_cache: true