Remove support for Internet Explorer (IE)

[patphongs]

Summary

What we're after: As a web development team, we want to remove support for Internet Explorer (IE) so that we can optimize our codebase, ehance user experience, and leverage modern web technologies without the constraints imposed by an outdated browser.

Completion criteria

• [x] Update notification banner on the website for IE users informing them of the end of support
• [ ] Update the codebase to remove
  • [x] All IE-specific polyfills and workarounds.
  • [x] Remove the imports and packages specific for IE
  • [x] Update the CSS and JS to use modern features that are not compatible with IE. (CSS prefixes, babel settings)
  • [x] Remove the X-UA-Compatible tag

[patphongs]

I approve the removal of support for internet explorer for these reasons: End of support was in June 2022 and outdated features are not considered best practice for modern web technologies.