chore: migrate from docker compose to kubernetes deployment

- Replace Docker Compose setup with Kubernetes manifests for deployment
- Simplify Dockerfile to use PHP's built-in server instead of nginx+supervisor
- Add Makefile with build and deploy commands for local development
- Update environment configuration for production deployment
- Remove docker-specific configuration files (nginx.conf, supervisord.conf)

Makefile

@@ -0,0 +1,11 @@
+IMG := mkm-admin
+
+build:
+	podman build -t $(IMG) .
+
+deploy: build
+	@if [ ! -f .env ]; then cp .env.example .env; fi
+	kubectl create secret generic mkm-admin-env --from-env-file=.env --dry-run=client -o yaml | kubectl apply -f -
+	kubectl apply -f k8s/deployment.yaml
+
+.PHONY: build deploy