[Data catalog] Deploy the dbt-generated documentation as a static site

[jeancochrane]

Running dbt docs generate in the dbt/ directory will generate target/index.html, an HTML version of the documentation for our dbt models and tests. Use this file to deploy our documentation as a static site.

There are a number of good options for deploying static sites; in roughly descending order of preference:

1. GitHub Pages
2. AWS S3 with a CloudFront CDN
3. Netlify

GitHub Pages is preferred since it is easy to use and already integrated into GitHub; S3 + CloudFront is next on the list since we already pay for AWS; and Netlify is last in the priority queue because we don't use it yet, but it's very easy to set up so it's a plausible option if the first two don't work for whatever reason.

[jeancochrane]

We're going to use GitHub Pages to deploy the site via an Action, so I'm going to archive this issue in favor of #34.