docs: Modernize Docs UI with Tailwind, Dark Mode, and Improved Layout (#3814)

* fix: fix link issues of _doc.html

* fix:wrong changes done

* docs:Improved the UI for Docs page

* docs:final changes to UI redesign

* fix:fixes dark light mode toggle in demo page

* fix: fixed linting error after dark mode changes

* feat:add mobile responsive design

* fix: fix broken links of nav bar

* fix:dark mode flash fix and backward url compatibility

* fix:demo page fix

* fix: fix linting error

* fix:clean url and hamburger menu button

* fix:fix formatting issues and more device inclusive responsive design

* fix: reverts build.js to original state