Remove automatic deployment prompt from setup script

Changes:
- scripts/setup-homelab.sh: Remove interactive deployment prompt
  - Users must now run deploy script manually
  - Simplifies both scripts (no sudo workarounds needed)
  - Clearer two-step process: setup then deploy

- Documentation updates:
  - README.md: Updated step 3-4 with manual deployment
  - docs/getting-started.md: Removed step 6 (log out), clarified steps
  - docs/manual-setup.md: Added sudo to deploy command
  - docs/troubleshooting/COMMON-ISSUES.md: Added sudo to all deploy commands

Rationale:
- Automatic deployment via 'su -' cannot work with sudo requirement
- Manual two-step process is clearer and more reliable
- Setup focuses on configuration, deploy focuses on services

docs/getting-started.md

@@ -67,13 +67,11 @@ For most users, the automated setup script handles everything:
    - Set up Docker networks (homelab, traefik, dockerproxy, media)
    - Detect NVIDIA GPU and offer driver installation
    
-6. **Log out and back in** (or run `newgrp docker`)
-   > Don't skip this step!  
-   Required for Docker group permissions.
+   **Important:** If NVIDIA drivers were installed, reboot your system now before continuing.
 
-7. **Deploy homelab**:
+6. **Deploy homelab**:
    ```bash
-   ./scripts/deploy-homelab.sh
+   sudo ./scripts/deploy-homelab.sh
    ```
    
    **The deploy script automatically:**