Housing counselor pipeline

Pipeline to keep data fresh for https://www.consumerfinance.gov/find-a-housing-counselor/

Mainly consists of two management commands:

• hud_generate_json to make per-zipcode json files from HUD housing counselor data
• hud_generate_html which ingests the above json and creates html files from it

Internally, we pass these html files to a pdf generator so that pdfs are easily downloadable at stable endpoints.

There is also a third, rarely run, management command hud_geocode_zipcodes which geocodes all zipcodes if a mapbox access token is set.