Cleanup Legacy docs

[ThomasLaPiana]

Closes #2021

Code Changes

• landing page action item to visit new docs site
• remove redundant docs pages

Steps to Confirm

• nox -s docs_serve and poke around

Pre-Merge Checklist

• All CI Pipelines Succeeded
• Documentation:
  • documentation complete, PR opened in fidesdocs
  • documentation issue created in fidesdocs
• Issue Requirements are Met
• Relevant Follow-Up Issues Created
• Update CHANGELOG.md

Description Of Changes

Removes all of the pages that are now made redundant and encourages visitors to go to the new docs site. Retains the helpful autogenerated docs and developer-centric pages

Note that all remaining docs infrastructure remains in place, new docs versions will be continually pushed out, etc. The change here is the removal of redundant docs pages and pointing users to the new ones.

[sanders41]

I tested and all seems good. My only question is why do we want two different docs sites? Why not just put everything in one place?

[ThomasLaPiana]

I tested and all seems good. My only question is why do we want two different docs sites? Why not just put everything in one place?

Good question...

1. We have a lot of legacy marketing materials that point to these docs URL, so for that reason we want to at least push people towards the new docs site if they end up at the legacy site
2. With the new site we lost the ability to integrate the autogenerated docs (CLI and API) which in my opinion are actually critical...so this will be the "engineering-led" docs area that still includes some of those critical autogenerated pieces

Ideally I'd like to move the new docs site back into this repo to decrease the friction of engineers contributing to docs directly, but that is something we'll tackle down the road