Adds docs/mcp-servers.md — the first documentation on how to configure
MCP servers in OpenClaude. Covers .mcp.json setup, the Firecrawl MCP
server for web scraping and search, available tools, and a pattern for
adding multiple servers.
Split the setup documentation into a simple beginner path and a separate advanced path. Add OS-specific quick starts for Windows and macOS/Linux so non-technical users can copy and paste the right commands without sorting through Bun and source-build instructions.