Move docs to root-level directory, add to CI process

[chanceaclark]

Reasons for making this change

Attempts to fix comment from #1604.

If this is related to existing tickets, include links to them as well.

Checklist

• I'm updating documentation
  • I've checked the rendering of the Markdown text I've added
• I'm adding or updating code
  • I've added and/or updated tests
  • I've updated docs if needed
• I'm adding a new feature
  • I've updated the playground with an example use of the feature

[epicfaace]

Just added a docs building step to the CI process so it won't break again.