chore(showcase): Add Shivam Sinha portfolio

[MrUltimate]

Description

Add personal website to showcase section.

[MrUltimate]

Anything else pending?

[Ekwuno]

Thanks for contributing @MrUltimate . Good to go!

[gatsbot]

Holy buckets, @MrUltimate — we just merged your PR to Gatsby! 💪💜

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[MrUltimate]

@Ekwuno Thank you!