chore: remove duplicate self-hosted-drawio.md (#188)

Content has been consolidated into docs/offline-deployment.md

docs/self-hosted-drawio.md

@@ -1,57 +0,0 @@
-# Self-Hosted Draw.io Configuration
-
-In some corporate environments, `embed.diagrams.net` is blocked by network policies. This guide explains how to use a self-hosted draw.io instance with Next AI Draw.io.
-
-## Configuration
-
-Set the `NEXT_PUBLIC_DRAWIO_BASE_URL` environment variable to point to your self-hosted draw.io instance. This is a **build-time** configuration, meaning you need to rebuild the Docker image to change the URL.
-
-## Docker Build
-
-```bash
-# Build with custom draw.io URL
-docker build --build-arg NEXT_PUBLIC_DRAWIO_BASE_URL=http://your-drawio-server:8080 -t next-ai-draw-io .
-
-# Run the custom build
-docker run -d -p 3000:3000 --env-file .env next-ai-draw-io
-```
-
-## Docker Compose
-
-```yaml
-services:
-  drawio:
-    image: jgraph/drawio:latest
-    ports:
-      - "8080:8080"
-
-  next-ai-draw-io:
-    build:
-      context: .
-      args:
-        - NEXT_PUBLIC_DRAWIO_BASE_URL=http://drawio:8080
-    ports:
-      - "3000:3000"
-    env_file:
-      - .env
-```
-
-## Running Draw.io Locally
-
-You can run the official draw.io Docker image:
-
-```bash
-docker run -d -p 8080:8080 jgraph/drawio:latest
-```
-
-Then build Next AI Draw.io with:
-
-```bash
-docker build --build-arg NEXT_PUBLIC_DRAWIO_BASE_URL=http://localhost:8080 -t next-ai-draw-io .
-```
-
-## Notes
-
-- The default draw.io URL is `https://embed.diagrams.net`
-- Changes to `NEXT_PUBLIC_DRAWIO_BASE_URL` require rebuilding the Docker image
-- For local development, you can set this in `.env.local`