HTML indexer proof-of-concept

• With a Python virtualenv in hand, install requirements from requirements.txt.
• Run python -m hindex -i input/jargon-4.4.7/html -o out/data where input/jargon-4.4.7/html is a directory tree of HTML files. A structure of JSON files – one index file and several sub-index files – are created under out/data.
• Have a web server serve the out/ directory. live-server or serve from npm work great, but python -m http.server should do in a pinch.