Update broken links

[dlederle]

The docs directory appears to have moved, so I've updated the links.

I was unable to find a direct link for fork (The link titled 'Split up application state in large apps') but guessed from reading that it was referencing Domains.

What kind of change does this PR introduce?

• Documentation

Does this PR introduce a breaking change?

• No

If yes, please describe the impact and migration path for existing applications:

Does this PR fulfill these requirements:

• [ ] All tests are passing
• [ ] yarn pretty has been run
• [ ] Commits reference open issues

Additional Information

[nhunzaker]

Ack. Thank you so much. I guess I didn't clean up all of my mess when we moved to a mono-repo 😅 .

Thanks!