docs: Replace base64 encoded image with proper svg

[prem-k-r]

The favicon.svg was actually just a base64 encoded PNG. It wasn't a proper scalable SVG.
Built svg from the main logo

D.JS in the svg is 1/sqrt(2) * width and placed horizontally and vertically center.
Also optimized the path using SVGO

Status and versioning classification:

This PR only includes non-code changes, like changes to documentation, README, etc.

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[Qjuh]

I'm not convinced this is an improvement:

• this is a favicon, it won't ever show anywhere in a size were being scalable matters
• on mobile safari the new svg icon actually looks worse than the png (maybe because safari sucks at rendering SVG)

[prem-k-r]

• on mobile safari the new svg icon actually looks worse than the png (maybe because safari sucks at rendering SVG)

Ah ok, nevermind then

Thanks for the review, closing this.

The svg can be useful to get high quality image.

like: