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

@@ -0,0 +1,17 @@
+# 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: /mnt/media