Clean up the logo for the readme

[D3FaltXD]

🐞 The rough edges and bad color scheme for dark mode

🎯 Fix the logol

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[KaranSinghBisht]

Hey @D3FaltXD after the fix, should I add the logo png in the src folder?

[D3FaltXD]

yea sure... will make a pull request with the job done

[JeS24]

Ensure that the logo looks good in both light and dark modes.

[JeS24]

We need to update this image file for the changes to work everywhere (including the logo in the README) - https://github.com/einsteinpy/blog.einsteinpy.org/blob/master/img/logo.png.