Refactor docs structure and update project readme

[AdamBarnhard]

• For both the docs landing page and the readme, just include the Create a Project and link to the docs for the rest.
• Add an example section to the main readme and the docs landing page.
• Switch the project readme to just include the intro, prereqs, and setup and link to docs instead for the rest.

TODOs:

• [ ] Once we land on the structure, push this structure to the main readme
• [ ] Make issue to fill in example links when those are done