fix: Update documentation and add English versions for all guides [skip ci]

README.en.md

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+# Simple Notes Sync 📝
+
+> Minimalist offline notes with auto-sync to your own server
+
+[![Android](https://img.shields.io/badge/Android-8.0%2B-green.svg)](https://www.android.com/)
+[![Material Design 3](https://img.shields.io/badge/Material-Design%203-green.svg)](https://m3.material.io/)
+[![License](https://img.shields.io/badge/License-MIT-yellow.svg)](LICENSE)
+
+**📱 [APK Download](https://github.com/inventory69/simple-notes-sync/releases/latest)** · **📖 [Documentation](DOCS.en.md)** · **🚀 [Quick Start](QUICKSTART.en.md)**
+
+**🌍 Languages:** [Deutsch](README.md) · **English**
+
+---
+
+## Features
+
+- 📝 Offline-First - Notes always available
+- 🔄 Auto-Sync - Configurable intervals (15/30/60 min)
+- 🏠 Self-Hosted - WebDAV on your server
+- 🔐 Privacy-First - No cloud, no tracking
+- 🔋 Battery-friendly - ~0.2-0.8% per day
+
+---
+
+## 🚀 Quick Start
+
+### 1. Server Setup
+
+```bash
+cd server
+cp .env.example .env
+# Set password in .env
+docker compose up -d
+```
+
+➡️ **Details:** [Server Setup Guide](server/README.en.md)
+
+### 2. App Installation
+
+1. [Download APK](https://github.com/inventory69/simple-notes-sync/releases/latest)
+2. Install & open
+3. ⚙️ Settings → Configure server
+4. Enable auto-sync
+
+➡️ **Details:** [Complete guide](QUICKSTART.en.md)
+
+---
+
+## 📚 Documentation
+
+- **[Quick Start Guide](QUICKSTART.en.md)** - Step-by-step guide for end users
+- **[Server Setup](server/README.en.md)** - Configure WebDAV server
+- **[Complete Docs](DOCS.en.md)** - Features, troubleshooting, build instructions
+
+---
+
+## 🛠️ Development
+
+```bash
+cd android
+./gradlew assembleStandardRelease
+```
+
+➡️ **Details:** [Build instructions in DOCS.en.md](DOCS.en.md)
+
+---
+
+## 📄 License
+
+MIT License - see [LICENSE](LICENSE)
+
+**v1.1.0** · Built with Kotlin + Material Design 3