Remove broken link in README

[mustpax]

The Sequence Design link at the bottom of the README currently points to a parked domain. This pull request removes the broken link.

Changes Made:

Removed the Sequence Design link that pointed to a parked domain.

References:

A loom video recording of the issue can be found here

[mrsarm]

I would suggest instead to point to the article from the Internet Archive: https://web.archive.org/web/20210523054802/https://decimals.substack.com/p/things-i-wish-i-knew-before-building

It's a good article after all.

[mustpax]

@mrsarm Good idea. Updated.