update README, app text (test deployment PR)

[exzo-14]

Description

DEV-11

This is a PR containing small changes to test deployment previews and automatic deployment:
Updated README: added "Vite" and "Netlify" headings.
Updated App.js default text to "Neptune Navigators App"

Type of change

Deployment Test PR

• added "Vite" and "Netlify" headings in README
• updated app.js text to "Neptune Navigators App"

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings

Testing Instructions

Review the README and view Netlify deployment preview.

Gotchas/What I learned

Learning more about deployment and Netlify.

[netlify]

✅ Deploy Preview for neptunenav ready!

Name	Link
🔨 Latest commit	bf05d72
🔍 Latest deploy log	https://app.netlify.com/sites/neptunenav/deploys/662416ea1e7d33000891ecef
😎 Deploy Preview	https://deploy-preview-10--neptunenav.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

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[exzo-14]

Deployment Preview canceled because there were no changes to the base directory. (I updated the README outside of the base directory). Will attempt again.

[exzo-14]

Adding commit bf05d72 to the PR resulted in a successful deployment preview build.

Ready for review.