43 onboarding docs review

[magants]

Description & motivation:

Initial review of the onboarding docs.

Screenshots:

n/a

References or links:

• Onboarding

Checklist:

• [x] I filled out my PR.
• [x] I assigned a reviewer(s) to my PR.
• [x] My pull request represents one logical piece of work.
• [x] My commits are related to the pull request and look clean.
• [ ] My SQL follows the UCSC Style Guide.
• [ ] My SQL passes linting with SQLFLuff and I have included the screenshot for verification.
• [ ] I have materialized my models appropriately.
• [ ] I have added appropriate tests and documentation to any new models.
• [ ] I have updated the README file.