API endpoint for project + zonefacts

[NealHumphrey]

Create a project table endpoint that joins the project table to the ZoneFacts table 3 times, once for each zone type (ward, neighborhood_cluster, census_tract). This join should be used for to replace the current 'project' endpoint in the front end app (stored in /core/housing-insights.js URLS: project), to provide additional columns of data to anywhere the project table is used.

[jkwening]

@NealHumphrey is this the same task as the last action item in #388 - left join project table/zone_facts?

[NealHumphrey]

@jkwening Yep! And it's actually what I just put into the PR in #438 (sorry should have updated these ticket too!)

[NealHumphrey]

Resolved in #438