Mimurawil/1338 update readme shopify next tailwind

[mimurawil]

Type of change

• Documentation change
• Bug fix

Summary of change

Updating shopify-next-tailwind readme file regarding Headless app usage, and removing unused env vars from the example file.

Checklist

• These changes follow the contributing guidelines
• This starter kit has been approved by the maintainers
• Changes for this new starter kit are being pushed to an integration branch instead of main
• All dependencies are version locked
• This fix resolves #
• I have verified the fix works and introduces no further errors

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[sonarqubecloud]

Quality Gate passed

Kudos, no new issues were introduced!

0 New issues
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarCloud

[thisdot-bot]

Hi @mimurawil. 👋

Your PR has been approved and merged. 🎉

Thank you for your continued contributions to starter.dev. ❤️

Keep up the great work!