initialize quickstart guide

Quickstart.md

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+# Quickstart: Docker Compose
+
+## Test (completely open, one command)
+
+```bash
+git clone https://git.morlana.online/f.weber/aptly-containerized.git
+cd aptly-containerized
+docker compose -f compose/docker-compose.test.yaml up -d --build
+```
+
+That's it. No auth, no GPG, ephemeral volumes. After a few seconds:
+
+```bash
+curl http://localhost:8080/                 # repo index (empty until you push something)
+curl http://localhost:8080/api/ready         # {"Status":"Aptly is ready"}
+```
+
+A demo repo `demo` (distribution `stable`, component `main`) is already created and
+published (`compose/config/state.test.yaml`) — it just doesn't have any packages yet.
+
+Build and push your own package (see [packaging](packaging) for details):
+
+```bash
+docker build -f images/aptly-deb-builder/Dockerfile -t aptly-deb-builder .
+docker run --rm -v "$PWD/my-project:/work" -w /work aptly-deb-builder \
+  aptly-release --config nfpm.yaml -- \
+    --repo demo --distribution stable --no-sign
+
+curl http://localhost:8080/dists/stable/main/binary-amd64/Packages
+```
+
+Tear down: `docker compose -f compose/docker-compose.test.yaml down -v`.
+
+## Production
+
+```bash
+cd compose
+cp .env.example .env            # edit: at minimum set APTLY_INTERNAL_PASSWORD
+cp config/users.example config/users   # edit: real credentials for write access
+mkdir -p config/gpg             # optional: drop private.asc (+ passphrase) in here
+docker compose up -d
+docker compose logs -f aptly-init   # check: users hashed correctly? GPG key found?
+```
+
+The default security mode is `publicRead`: reading (apt clients) is open, writing
+(`/api/`) needs Basic Auth. Other modes and the pitfalls around
+`security.write.allowCIDRs` behind a reverse proxy are covered in
+[security](security).
+
+Declare your own repos/mirrors/publish targets in `compose/config/state.yaml` (a
+starter template is already there) — the `reconcile` service in `docker-compose.yaml`
+converges towards it on every start, without touching existing packages.
+
+**Storage resizing, backup/restore, GPG key rotation:** see [operations](operations).
+
+# Quickstart: Helm
+
+## Installation
+
+```bash
+helm registry login git.morlana.online   # if the chart stays private
+helm install aptly oci://git.morlana.online/f.weber/aptly --version <chart-version> \
+  --set security.preset=publicRead \
+  --set ingress.enabled=true \
+  --set ingress.repo.host=apt.example.com
+```
+
+Without `ingress.enabled` you immediately get a `kubectl port-forward` hint printed
+in the Helm NOTES — nothing needs to be configured up front to try the chart locally
+(e.g. in kind/k3d).
+
+## Configuring it especially easily — the three axes
+
+1. **Security — one switch:**
+   ```yaml
+   security:
+     preset: open   # | publicRead (default) | authenticated | readOnly
+   ```
+   Full matrix including the Ingress `split` variant and the
+   `trustedProxies`/`allowCIDRs` pitfalls: [security.md](security.md).
+
+2. **aptly configuration — curated keys + passthrough:**
+   ```yaml
+   aptly:
+     architectures: [amd64, arm64]
+     metrics:
+       enabled: true
+     configOverrides:          # any aptly config key, 1:1, always wins
+       s3_publish_endpoints:
+         cdn: { region: eu-central-1, bucket: apt-morlana }
+   ```
+   `configOverrides` is merged over the generated config last — nothing in aptly's
+   own configuration is ever unreachable through this chart.
+
+3. **Declarative state — repos/mirrors/publish in `values.yaml`:**
+   ```yaml
+   aptly:
+     localRepos:
+       - { name: stable, defaultDistribution: stable, defaultComponent: main }
+     publish:
+       - name: stable-root
+         prefix: ""
+         distribution: stable
+         sourceKind: local
+         sources: [{ name: stable, component: main }]
+         architectures: [amd64, arm64]
+   ```
+   A Helm hook Job reconciles this against the running instance after every
+   `helm install`/`helm upgrade` — see [packaging.md](packaging.md) for the exact
+   semantics (idempotency, what can NOT be changed after the fact, prefix escaping).
+
+## Health check
+
+```bash
+kubectl exec <release>-aptly-0 -c aptly -- curl -fsS http://127.0.0.1:8080/api/ready
+kubectl logs job/<release>-aptly-reconcile   # only visible right after install/upgrade
+```
+
+## Storage resizing
+
+`persistence.size` on an already-installed StatefulSet is **immutable** — see
+[operations](operations) for the recovery procedure, and set
+`persistence.existingClaim` from the start in production instead of the
+chart-generated `volumeClaimTemplate`.
+