docs: implement professional documentation structure and project hygiene

docs/README.md

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+# Plexus Documentation
+
+Welcome to the official documentation for **Plexus**, a decentralized crypto chat application.
+
+## 📖 Table of Contents
+
+- [Architecture Overview](file:///home/sinan/Documents/repositories/local/plexus/docs/architecture.md) - How the system works.
+- [Development Guide](file:///home/sinan/Documents/repositories/local/plexus/docs/development.md) - Guidelines for contributors.
+- [Task Tracker](file:///home/sinan/Documents/repositories/local/plexus/docs/tasks.md) - How to use the internal task management system.
+- [Scalability & Roadmap](file:///home/sinan/Documents/repositories/local/plexus/docs/scalability.md) - Thinking bigger.
+
+## 🚀 Quick Start
+
+To get started with development, please refer to the [Development Guide](file:///home/sinan/Documents/repositories/local/plexus/docs/development.md).
+
+## 🛠 Tech Stack
+
+- **Frontend**: Vue 3, Vite, TailwindCSS, Pinia.
+- **Backend**: Node.js, Express, Socket.IO.
+- **Database**: DuckDB (for chat history and task tracking).
+- **Blockchain**: Solana (simulated transactions).