Developer documentation overhaul - Phase 1

[ertemann]

Issue which covers phase 1/6 of issue #30

Do quick repairs on the docs - make sure links work, nothing is immediately incorrect, etc.

Some of this has been done already, but it’s clear that more attention needs done from a quick pass perspective. This is intended as a stopgap solution. Get in, so that while working on step 2, incoming developers are in a better state.

List of completed actions/necessary steps:

• Check all links
• etc
• more

ETA before 23 january 2022

[PrivatePixels]

Please tag me if you need anything merged🙏🏾