docs(README.md): remove outdated userscript documentation and browser integration setup

README.md

@@ -40,14 +40,6 @@ Then visit `http://localhost:8000` to start managing your AdGuard Home filtering
 - ✅ Implements official AdGuard Home API spec
 - 🐳 Docker support
 
-### Browser Integration
-- 🔎 404 Page Checker Userscript
-  - Automatically detects 404 responses while browsing
-  - Checks if failed domains are blocked by AdGuard Home
-  - Shows unblock notifications with one-click actions
-  - Configurable settings and caching system
-  - Tampermonkey integration for all major browsers
-
 ## Requirements
 
 ### System Requirements
@@ -158,18 +150,6 @@ python -m uvicorn src.simpleguardhome.main:app --reload
 
 The application will be available at `http://localhost:8000`
 
-## Browser Integration Setup
-
-1. Install the [Tampermonkey](https://www.tampermonkey.net/) browser extension
-2. Navigate to the `userscript` directory in this repository
-3. Install the `simpleguardhome-404-checker.user.js` script
-4. Configure the script with your AdGuard Home instance details
-
-The userscript will automatically:
-- Monitor web requests for 404 responses
-- Check if failed domains are blocked
-- Show notifications for blocked domains
-- Provide quick unblock options
 ## API Documentation
 
 The API documentation is automatically generated by FastAPI using:
@@ -226,9 +206,6 @@ simpleguardhome/
 │           └── index.html   # Web interface
 ├── static/
 │   └── simpleguardhome.png  # Project logo
-├── userscript/
-│   ├── README.md           # Userscript documentation
-│   └── simpleguardhome-404-checker.user.js
 ├── rules_backup/          # Backup storage location
 ├── requirements.txt
 ├── setup.py