feat: a new floating header bar under landing page

[Piyush-linux]

• An button to be nested under landing promo
• It should be mobile responsive too

closes #1217

👷🏻 Changes made

• lansing.jsx : added button with text check it out
• lansing.scss : for making mobile responive

📸 Screenshots

• mobile responsive too

[github-actions[bot]]

This pull request has been deployed to Vercel.

Latest commit:	c7e50f4
✅ Preview:	https://milan-6ks2wbf7o-iamtamal.vercel.app
🔍 Inspect:	https://vercel.com/iamtamal/milan/DCyWLD6jjJBaGSFPfBMgrmPAW9VD

View Workflow Logs