docs: reconstruct READMEs

metabase/README.md

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+# Metabase
+
+Business intelligence and data visualization platform:
+
+- Open-source analytics and dashboards
+- Interactive data exploration
+- PostgreSQL integration for data storage
+- Automated setup with Helm
+- Session management through Vault/External Secrets
+- Simplified deployment (no OIDC dependency)
+
+## Installation
+
+```bash
+just metabase::install
+```
+
+## Access
+
+Access Metabase at `https://metabase.yourdomain.com` and complete the initial setup wizard to create an admin account.