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/prometheus/node_deploy.yml

@@ -0,0 +1,14 @@
+---
+- hosts: ubuntu
+  become: true
+  tasks:
+  - name: Aptitude Update
+    apt:
+      name: "*"
+      state: latest
+      update_cache: true
+
+  - name: Install Prometheus Node Exporter
+    apt:
+      name: prometheus-node-exporter
+      state: present