Adds cryptpad app.

cryptpad/versions/2024/README.md

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+# CryptPad
+
+CryptPad is a privacy-first, end-to-end encrypted collaboration suite. Documents are encrypted in the browser before being stored — the server never sees plaintext content.
+
+## Configuration
+
+Key settings in `config.yaml`:
+
+- **domain** - Main domain for CryptPad
+- **sandboxDomain** - Sandbox subdomain for secure iframe isolation (default: `cryptpad-sandbox.{your-cloud-domain}`)
+- **storage** - Persistent volume size (default: `2Gi`)
+
+## Usage
+
+No account is required to create documents. Just visit the app URL and start creating spreadsheets, code pads, presentations, or rich-text documents. Share the document URL with collaborators.
+
+## Admin Setup
+
+To access the admin panel, you need to register an account and then link it to the `adminKey` secret:
+
+1. Register an account at the app URL
+2. Go to your user settings and copy your **Public Signing Key**
+3. The `adminKey` in `secrets.yaml` should match this key — it is pre-populated with a generated value, but you must replace it with your actual account's public signing key after registering
+4. Once set, the **Admin** link will appear in the user menu
+
+## Notes
+
+- Both the main domain and the sandbox domain must be accessible — CryptPad uses the sandbox domain for secure iframe isolation, and the app will not function correctly if one is missing
+- All encryption keys are generated client-side — if you lose your account passphrase, documents cannot be recovered
+- The instance can be configured to require registration before creating documents (via the admin panel)