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/hass/configuration.yaml.j2

@@ -0,0 +1,33 @@
+# Loads default set of integrations. Do not remove.
+default_config:
+
+# ISAL accelerates aiohttp
+isal:
+
+# Load frontend themes from the themes folder
+frontend:
+  themes: !include_dir_merge_named themes
+
+automation: !include automations.yaml
+script: !include scripts.yaml
+scene: !include scenes.yaml
+
+homeassistant:
+  media_dirs:
+    media: {{hass_media_directory}}
+
+# HTTP configuration for reverse proxy (HAProxy on Titania)
+http:
+  server_port: {{hass_port}}
+  use_x_forwarded_for: true
+  trusted_proxies:
+    - 10.0.0.0/8
+
+# PostgreSQL recorder (Portia)
+recorder:
+  db_url: "postgresql://{{hass_db_user}}:{{hass_db_password}}@{{hass_db_host}}:{{hass_db_port}}/{{hass_db_name}}"
+  purge_keep_days: 30
+  commit_interval: 1
+
+# Prometheus metrics endpoint
+prometheus: