chore(templates): restore optional entry files

[mcansh]

Reverts #5455

todo

• mention they’re optional and can be deleted.
• mention remix reveal

[changeset-bot]

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Latest commit: 1f87327

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[github-actions]

🤖 Hello there,

We just published version 1.15.0 which includes this pull request. If you'd like to take it for a test run please try it out and let us know what you think!

Thanks!