docs: Update README, add TROUBLESHOOTING

[nicolechung]

What changed

• [x] add --reuse-existing-versions to README
• [x] add --ignore-existing-dependencies to README
• [x] add TROUBLESHOOTING document
  • [x] lockfile changes
  • [x] new typescript errors
  • [x] new test failures in the test-app
  • [x] test app will not run locally
  • [x] the addon could be forgotten to have been added to the test-app
  • [x] monorepo specific troubleshooting

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[changeset-bot[bot]]

⚠️ No Changeset found

Latest commit: 9363516c9dd8ca670ab70d6bbad66569d1fc2014

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[NullVoxPopuli]

This is immensely helpful! thank you!