chore(docs): document additional metro overrides

[erquhart]

Motivation

Recommendation from metro maintainer: facebook/metro#979 (comment)

• Docs say to use metro and metro-resolver 0.76.0 or newer
• Many folks, like me, will try using a range to stay up to date
• As of 0.76.4, other metro packages being at different versions cause errors and build failures

Execution

• Add additional metro overrides to docs that are known to be required for 0.76.4:
  • metro-config
  • metro-transform-worker
• Add a troubleshooting note for folks that may run into metro package version sync issues

[erquhart]

Goes without saying, but feel free to close w/o merging if this feels too specific to be generally useful. Thanks for a fantastic lib 🚀

[erquhart]

@EvanBacon added npm instructions too 👍

[EvanBacon]

Closing in favor of #734 -- also metro overrides aren't needed in SDK 49