migration: upgraded the docs codebase from Nextra 3.X to 4.X & added tailwind 4 support

[jeevankc17]

Description

Hey I migrated the docs to the latest version possible

Issue Reference

Issued no #59

Proposed Changes

Upgraded the docs directory

• From page router to app router
• tailwind css support
• with proper type defined

Screenshots / GIFs / Videos

Checklist

• [x ] Lint rules are passed correctly
• [x ] Code builds correctly
• [x ] All existing and new tests passed
• [x ] Pull request title is concise and descriptive.
• [x ] Pull request is linked to the related issue.

[ashiishme]

Can you please check the reviews above? @jeevankc17

[jeevankc17]

@ashiishme done! Sorry for the late fixes!