docs: add docusaurus docs (#118)

Co-authored-by: Elias Schneider <login@eliasschneider.com>

docs/docs/setup/installation.md

@@ -0,0 +1,73 @@
+---
+id: installation
+---
+
+# Installation
+
+# Before you start
+
+Pocket ID requires a [secure context](https://developer.mozilla.org/en-US/docs/Web/Security/Secure_Contexts), meaning it must be served over HTTPS. This is necessary because Pocket ID uses the [WebAuthn API](https://developer.mozilla.org/en-US/docs/Web/API/Web_Authentication_API).
+
+### Installation with Docker (recommended)
+
+1. Download the `docker-compose.yml` and `.env` file:
+
+   ```bash
+    curl -O https://raw.githubusercontent.com/stonith404/pocket-id/main/docker-compose.yml
+
+    curl -o .env https://raw.githubusercontent.com/stonith404/pocket-id/main/.env.example
+   ```
+
+2. Edit the `.env` file so that it fits your needs. See the [environment variables](/pocket-id/configuration/environment-variables) section for more information.
+3. Run `docker compose up -d`
+
+You can now sign in with the admin account on `http://localhost/login/setup`.
+
+### Unraid
+
+Pocket ID is available as a template on the Community Apps store.
+
+### Stand-alone Installation
+
+Required tools:
+
+- [Node.js](https://nodejs.org/en/download/) >= 20
+- [Go](https://golang.org/doc/install) >= 1.23
+- [Git](https://git-scm.com/downloads)
+- [PM2](https://pm2.keymetrics.io/)
+- [Caddy](https://caddyserver.com/docs/install) (optional)
+
+1. Copy the `.env.example` file in the `frontend` and `backend` folder to `.env` and change it so that it fits your needs.
+
+   ```bash
+   cp frontend/.env.example frontend/.env
+   cp backend/.env.example backend/.env
+   ```
+
+2. Run the following commands:
+
+   ```bash
+   git clone https://github.com/stonith404/pocket-id
+   cd pocket-id
+
+   # Checkout the latest version
+   git fetch --tags && git checkout $(git describe --tags `git rev-list --tags --max-count=1`)
+
+   # Start the backend
+   cd backend/cmd
+   go build -o ../pocket-id-backend
+   cd ..
+   pm2 start pocket-id-backend --name pocket-id-backend
+
+   # Start the frontend
+   cd ../frontend
+   npm install
+   npm run build
+   pm2 start --name pocket-id-frontend --node-args="--env-file .env" build/index.js
+
+   # Optional: Start Caddy (You can use any other reverse proxy)
+   cd ..
+   pm2 start --name pocket-id-caddy caddy -- run --config reverse-proxy/Caddyfile
+   ```
+
+You can now sign in with the admin account on `http://localhost/login/setup`.