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/alloy/config.alloy.j2

@@ -0,0 +1,24 @@
+// Default Alloy Configuration
+// Standard system monitoring and log collection
+
+logging {
+  level = "{{alloy_log_level}}"
+  format = "logfmt"
+}
+
+// Loki log forwarding
+loki.write "default" {
+  endpoint {
+    url = "{{ loki_url }}"
+  }
+}
+
+// System log collection
+loki.source.journal "systemd_logs" {
+  forward_to = [loki.write.default.receiver]
+  labels = {
+    job = "systemd",
+    hostname = "{{ inventory_hostname }}",
+    environment = "{{ deployment_environment }}",
+  }
+}