favicon: Add icons

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[surajssd]

Here one can see if the favicon shows up in all the browsers: https://realfavicongenerator.net/favicon_checker?protocol=https&site=deploy-preview-14--frolicking-manatee-96c0c8.netlify.app%2F

[surajssd]

In my manual testing the logo shows up on Chrome, Edge and Safari on MacOSX and Safari on iOS.

[surajssd]

This PR is ready for review.