Restructure documentation into separate files with links

docs/INSTALLATION.md

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+# Installation Guide
+
+## Quick Install on Ubuntu (One Command)
+
+```bash
+curl -fsSL https://raw.githubusercontent.com/nmemmert/monitor/main/install-ubuntu.sh | bash
+```
+
+The script will:
+- ✅ Install Node.js 20.x
+- ✅ Install PM2 process manager
+- ✅ Clone and set up the application
+- ✅ Configure firewall
+- ✅ Set up auto-start on boot
+- ✅ Guide you through email/webhook setup
+
+## Manual Installation
+
+### Prerequisites
+
+- Node.js (v14 or higher)
+- npm or yarn
+
+### Setup
+
+1. Install dependencies for both server and client:
+```bash
+npm run install-all
+```
+
+2. Create a `.env` file in the root directory (copy from `.env.example`):
+```bash
+cp .env.example .env
+```
+
+3. Configure your `.env` file:
+```env
+PORT=3001
+
+# Email Notifications (optional)
+EMAIL_ENABLED=true
+EMAIL_HOST=smtp.gmail.com
+EMAIL_PORT=587
+EMAIL_USER=your-email@gmail.com
+EMAIL_PASS=your-app-password
+EMAIL_FROM=your-email@gmail.com
+EMAIL_TO=your-email@gmail.com
+
+# Webhook Notifications (optional)
+WEBHOOK_ENABLED=false
+WEBHOOK_URL=https://your-webhook-url.com
+```
+
+## Development Mode
+
+Run both server and client in development mode:
+```bash
+npm run dev
+```
+
+- Server runs on http://localhost:3001
+- Client runs on http://localhost:3000
+
+## Production Mode
+
+Build and run in production:
+```bash
+npm run build
+npm start
+```
+
+Server will serve the built React app on http://localhost:3001