feat: add dbt documentation

[Ian2012]

Description

This PR creates a GitHub workflow to generate the DBT docs and publish it to GitHub pages.

The destination branch is gh-pages and the documentation is generated on every push a main.

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[Ian2012]

cc @SoryRawyer

[bmtcril]

This won't work because the static content needs to be served out of either the site root or the /docs/ directory. I think we can use this as a template: https://medium.com/dbt-local-taiwan/host-dbt-documentation-site-with-github-pages-in-5-minutes-7b80e8b62feb

If you set up a gh-pages branch with the contents of the target dir like in that post I can create the static site and we can work on setting up an action to automatically push to that branch when something merges to main.

[Ian2012]

Seems like the SEMANTIC_RELEASE_BOT doesn't have access to this repository

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