Docs-as-code: full deploy configs, compose stacks, and DR guide

- Add root README and docs/ (architecture, hosts, disaster-recovery, operations)
- Add compose/ for superset, forgejo, lam, cadvisor; unified deploy compose
- Add scripts/deploy (deploy-atc-docker01.sh, container inventory export)
- Add inventory/containers-atc-docker01.json snapshot
- Add config READMEs for kafka and airflow; .env.example; expand .gitignore
- Sync atclab helper scripts; update homepage/superset compose with env support

config/airflow/README.md

@@ -0,0 +1,14 @@
+# Airflow
+
+| Bestand | Beschrijving |
+|---------|--------------|
+| `airflow.cfg` | Referentie-configuratie (deploy naar Airflow home op lake01) |
+| `generate_data_dag.py` | DAG voor demo data-generatie |
+
+## URL
+
+http://atc-lake01.dell-atc.lan:8080/ (of `10.0.21.55:8080` volgens netwerk)
+
+## Deploy
+
+Kopieer `generate_data_dag.py` naar de Airflow `dags/` folder op de lake-host en herstart de scheduler/webserver.

config/kafka/README.md

@@ -0,0 +1,25 @@
+# Kafka Connect — Debezium connectors
+
+JSON-definities voor CDC van databases naar Kafka.
+
+## Connectors
+
+| Bestand | Bron | Topic prefix |
+|---------|------|--------------|
+| `postgres-connector.json` | PostgreSQL op db02 | `postgres-sales` |
+| `mysql-connector.json` | MySQL | — |
+| `mongodb-connector.json` | MongoDB | — |
+
+## Deploy
+
+Vervang `PASSWORD_PLACEHOLDER` en pas host/poort aan. Registreer via Kafka Connect REST API op `atc-lake01` (Debezium `:8083`).
+
+```bash
+curl -X POST -H "Content-Type: application/json" \
+  --data @postgres-connector.json \
+  http://atc-lake01.dell-atc.lan:8083/connectors/
+```
+
+## Referentie
+
+- Kafka UI: http://atc-kafka01.dell-atc.lan:9000/

config/superset/docker-compose.yaml

@@ -5,8 +5,10 @@ services:
     restart: unless-stopped
     ports:
       - "8088:8088"
+    env_file:
+      - ../../.env
     environment:
-      - SUPERSET_SECRET_KEY=your-secret-key-here
+      - SUPERSET_SECRET_KEY=${SUPERSET_SECRET_KEY:-change-me}
       - SUPERSET_LOAD_EXAMPLES=no
     volumes:
       - ./superset_config.py:/app/pythonpath/superset_config.py