Find and Consoldate All Documentation Sources

Description

There currently exist a handful of sources of documentation for Autoware.Auto.

Expected behavior

There should be only a single source for Autoware.Auto documentation: the auto-generated docs at https://autowarefoundation.gitlab.io/autoware.auto/AutowareAuto/.

Definition of Done

• Move the parts of https://gitlab.com/autowarefoundation/autoware-foundation/-/wikis/home that pertain to Autoware.Auto to the docs folder
  • Add a link to https://autoware.org that references https://gitlab.com/autowarefoundation/autoware-foundation/-/wikis/home
• Discuss what to do with https://gitlab.com/autowarefoundation/autoware-specification