Add arod webserver for Bushel content
This is a tiny_httpd-based webserver that serves Bushel content
(notes, papers, projects, ideas, videos) as a website.
Features:
- TOML configuration via tomlt with XDG path support
- Route handlers for all entry types (notes, papers, projects, ideas, videos)
- Static file serving for assets, images, and static files
- Custom markdown rendering with Bushel link resolution
- Image srcset support via srcsetter
- Video embed handling with YouTube URL rewriting
- Logging middleware with request timing
- CLI with serve, init, and config commands
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>