refactor(project): move to monorepo

[joshblack]

Closes #2382

Updates project to monorepo structure in preparation for merge with other codebases.

Reviewer checklist:

• Lint staged works as expected
• Editor plugins work as expected in nested package (like prettier)
• Can still develop locally with fractal
• GitHub files are up-to-date
• CircleCI is running CI checks
• ESLint works as expected
• Tests run as expected, don't fail

[joshblack]

TODO

• Add root-level README.md file

[asudoh]

Good checklist @joshblack, just one addition:

• Build steps around Netlify deploy works

Seems that namedExports settings in our Rollup config need an update (Due to changed node_modules directory location)

[alisonjoseph]

Nice work on this Josh! tested developing, tests, linting and all seems to be working 🎉

[joshblack]

@asudoh for netlify, I think what we'll need to do is use GitHub actions alongside Netlify to trigger deployments for specific sub-directories.

When looking at this earlier, it seemed like a combination of diff-includes and cli would handle our use-cases for publishing netlify builds for sub-packages that have changed

In the interim though, I can definitely set it up so that it hosts the right directory though 👍

[asudoh]

LGTM 👍 from my perspective, would like feedback from others.

[emyarod]

looks good to me!