Organize markdown files into docs folder and move ErrorFallback component

Co-authored-by: johndoe6345789 <224850594+johndoe6345789@users.noreply.github.com>

docs/docker-compose.README.md

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+# Docker Compose Examples
+
+This directory contains example Docker Compose configurations for different deployment scenarios.
+
+## Files
+
+- `docker-compose.yml` - Default full stack with auto-configured backend
+- `docker-compose.backend-only.yml` - Backend service only
+- `docker-compose.dev.yml` - Development setup with hot reload
+
+## Usage
+
+### Full Stack (Frontend + Backend)
+
+```bash
+docker-compose up -d
+```
+
+Access:
+- Frontend: http://localhost:3000
+- Backend API: http://localhost:5000
+
+### Backend Only
+
+```bash
+docker-compose -f docker-compose.backend-only.yml up -d
+```
+
+Access:
+- Backend API: http://localhost:5000
+
+Then run frontend locally:
+```bash
+npm run dev
+```
+
+Configure frontend manually in Settings to use `http://localhost:5000`.
+
+### Development Mode
+
+```bash
+docker-compose -f docker-compose.dev.yml up -d
+```
+
+This runs:
+- Backend in Docker
+- Frontend expects you to run `npm run dev` locally with env var set
+
+## Environment Variables
+
+All configurations support these environment variables:
+
+### Backend
+- `DB_PATH` - SQLite database path (default: `/data/snippets.db`)
+
+### Frontend
+- `VITE_FLASK_BACKEND_URL` - Flask backend URL (enables auto-configuration)
+
+## Persistence
+
+All configurations use a Docker volume `snippet-data` for persistent storage.
+
+To backup:
+```bash
+docker run --rm -v codesnippet_snippet-data:/data -v $(pwd):/backup alpine tar czf /backup/snippets-backup.tar.gz /data
+```
+
+To restore:
+```bash
+docker run --rm -v codesnippet_snippet-data:/data -v $(pwd):/backup alpine tar xzf /backup/snippets-backup.tar.gz -C /
+```