a few improvements

[kelset]

Hey folks, opening a PR against the branch to help push this through the finish line. Happy to hop on a call and walk you through the main changes; here's a quick overview:

• the new folder, rn-tester-e2e needs to be excluded from the monorepo - its dependencies need to be handled separately
• documentation: I've updated the main README to be a bit more verbose, I'm still finishing work on that
• (still to do) we need to try and move to a situation where we use the references as described here

[github-actions]

	Fails
🚫	📋 Missing Changelog - Can you add a Changelog? To do so, add a "## Changelog" section to your PR description. A changelog entry has the following format: [CATEGORY] [TYPE] - Message. CATEGORY may be: General iOS Android JavaScript Internal (for changes that do not need to be called out in the release notes) TYPE may be: Added, for new features. Changed, for changes in existing functionality. Deprecated, for soon-to-be removed features. Removed, for now removed features. Fixed, for any bug fixes. Security, in case of vulnerabilities. MESSAGE may answer "what and why" on a feature level. Use this to briefly tell React Native users about notable changes.
🚫	❗ Base Branch - The base branch for this PR is something other than main or a -stable branch. Are you sure you want to target something other than the main branch?

	Warnings
⚠️	📋 Missing Summary - Can you add a Summary? To do so, add a "## Summary" section to your PR description. This is a good place to explain the motivation for making this change.
⚠️	🔒 package.json - Changes were made to package.json. This will require a manual import by a Facebook employee.
⚠️	📋 Missing Test Plan - Can you add a Test Plan? To do so, add a "## Test Plan" section to your PR description. A Test Plan lets us know how these changes were tested.

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