Added customised 404 page with well designed UI

[rsinghcodes]

Fixes #69

Screenshot

Please review under GSSOC '22 and merge it.

Thanks!

[vercel[bot]]

Someone is attempting to deploy a commit to a Personal Account owned by @geekymeeky on Vercel.

@geekymeeky first needs to authorize it.

[madihamallick]

Good Work @rsinghcodes