[flash-calendar] add homepage to package.json

[Simek]

Why & how

This PR adds the "homepage" field to the package.json file pointing out the the website.

Thanks to that change the package website will be visible in the React Native Directory entry.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 83e1c3a

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[MarceloPrado]

Oh, TIL! Thanks for the contribution 💯