docs(deploy): add netcup deploy runbook

Derived from netcup canonical DEPLOY-TEMPLATE.md. Same 9 sections
across all stacks (target, env, first-time, update, smoke,
troubleshooting, rollback, stack-specific notes, issue tracking).
README links to DEPLOY.md.

DEPLOY.md

@@ -0,0 +1,75 @@
+# Deploy runbook — cc (code-crispies)
+
+Derived from [`netcup/DEPLOY-TEMPLATE.md`](https://git.librete.ch/libretech/netcup/src/branch/main/DEPLOY-TEMPLATE.md).
+Section ordering and headings stable across stacks.
+
+## 1. Target
+
+| Field | Value |
+|-------|-------|
+| Vhost | `cc.cloud.librete.ch` |
+| Server path | `/srv/cc/` |
+| Repo | `git.librete.ch/public/code-crispies` |
+| Image source | build from source on remote (Dockerfile) — image tag `${CC_IMAGE:-cc:local}` |
+| Cert | edge caddy via INWX DNS-01 |
+| Edge net container name | `cc` (matches `caddy/Caddyfile` reverse_proxy target on `:80`) |
+
+## 2. Required env / secrets
+
+`/srv/cc/.env` (gitignored, mode 0600): only set if non-default behavior is needed (e.g. `CC_IMAGE` to use a registry-published tag).
+
+## 3. First-time deploy
+
+```sh
+ssh netcup 'docker network ls | grep -q edge || docker network create edge'
+ssh netcup 'mkdir -p /srv && cd /srv && git clone ssh://tengo@git.librete.ch:41240/public/code-crispies.git cc'
+ssh netcup 'cd /srv/cc && docker compose up -d --build'
+```
+
+## 4. Update deploy
+
+```sh
+n-deploy cc
+# = git push → ssh 'cd /srv/cc && git pull --ff-only && docker compose pull && docker compose up -d'
+```
+
+For source rebuilds:
+
+```sh
+ssh netcup 'cd /srv/cc && git pull --ff-only && docker compose up -d --build'
+```
+
+## 5. Smoke / health
+
+```sh
+n-ping cc.cloud.librete.ch
+n-cert cc.cloud.librete.ch
+n-svcs cc
+```
+
+UI smoke: lessons load, interactive Tailwind/CSS sandbox renders.
+
+## 6. Logs + troubleshooting
+
+| Symptom | First check |
+|---------|-------------|
+| 502 from edge | `cc` not up or off `edge` net |
+| Stale assets | rebuild image (`up -d --build`); browser cache |
+
+## 7. Rollback
+
+```sh
+ssh netcup 'cd /srv/cc && git log --oneline -n 5'
+ssh netcup 'cd /srv/cc && git reset --hard <previous-sha> && docker compose up -d --build'
+```
+
+## 8. Stack-specific notes
+
+- Stateless: no persistent volumes worth preserving (content is shipped in the image).
+- Pure static / Node-built site; no database.
+
+## 9. Issue tracking
+
+- Deploy issues: `git.librete.ch/public/code-crispies/issues`
+- Cross-stack: `libretech/netcup`
+- After every deploy: append to `netcup/deployments.md`.

README.md

@@ -3,6 +3,8 @@
 
 An interactive platform for learning HTML, CSS, and Tailwind CSS through practical challenges.
 
+> **Deploy / operate on netcup:** see [DEPLOY.md](DEPLOY.md) (canonical netcup runbook).
+
 ## 📚 Overview
 
 Code Crispies is a web-based learning platform designed to help users master HTML, CSS, and Tailwind CSS through hands-on exercises. The application presents a series of progressive challenges organized into themed modules, allowing learners to build their skills step by step while receiving immediate feedback.