Add a new `servedocs` Makefile target that runs `generate_docs.py --serve`, enabling continuous doc generation and local web serving. Extend the Python script with `RootedHTTPServer` and `RootedHTTPRequestHandler` classes to serve generated HTML files from the output directory, refreshing content on each request via `format_files(True)`. Also update the shebang to `python3` and change the conversion print message from "converted" to "Built".