Update README.md (#300)

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✨ Visit our [Documentation Website](https://crawl4ai.com/mkdocs/)
## Features ✨
- 🆓 Completely free and open-source
- 🚀 Blazing fast performance, outperforming many paid services
- 🤖 LLM-friendly output formats (JSON, cleaned HTML, markdown)
- 🌐 Multi-browser support (Chromium, Firefox, WebKit)
- 🌍 Supports crawling multiple URLs simultaneously
- 🎨 Extracts and returns all media tags (Images, Audio, and Video)
- 🔗 Extracts all external and internal links
- 📚 Extracts metadata from the page
- 🔄 Custom hooks for authentication, headers, and page modifications
- 🕵️ User-agent customization
- 🖼️ Takes screenshots of pages with enhanced error handling
- 📜 Executes multiple custom JavaScripts before crawling
- 📊 Generates structured output without LLM using JsonCssExtractionStrategy
- 📚 Various chunking strategies: topic-based, regex, sentence, and more
- 🧠 Advanced extraction strategies: cosine clustering, LLM, and more
- 🎯 CSS selector support for precise data extraction
- 📝 Passes instructions/keywords to refine extraction
- 🔒 Proxy support with authentication for enhanced access
- 🔄 Session management for complex multi-page crawling
- 🌐 Asynchronous architecture for improved performance
- 🖼️ Improved image processing with lazy-loading detection
- 🕰️ Enhanced handling of delayed content loading
- 🔑 Custom headers support for LLM interactions
- 🖼️ iframe content extraction for comprehensive analysis
- ⏱️ Flexible timeout and delayed content retrieval options
## Installation 🛠️
Crawl4AI offers flexible installation options to suit various use cases. You can install it as a Python package or use Docker.