Update documentation to reflect non-local hosting environment

DOCUMENTATION.md

@@ -35,4 +35,15 @@ OpenChat Overlay is a lightweight, open-source Twitch chat overlay solution desi
 - **Overlay:** Located in `src/app/overlay/[token]`. Publicly accessible but requires a valid token. Renders with a transparent background.
 
 ## Deployment
-(To be added: Instructions for building the Docker image and deploying to an LXC container.)
+
+### Infrastructure Overview
+- **Development:** Conducted on local desktop (CachyOS).
+- **Version Control:** Synced to `gitea.ramforth.net` under the `RamTech` organization.
+- **Production Host:** Standalone Proxmox LXC container or VM.
+- **Service URL:** Production will NOT be hosted on `localhost`. All external callbacks (Twitch Auth) must point to the production domain/IP.
+
+### Deployment Workflow
+1.  Push changes from local development machine to Gitea.
+2.  Pull changes on the production LXC/VM.
+3.  Build and run using Docker or as a systemd service.
+