Add sqs 'About the author'

Created by: st0nebraker

Who? Community team What? Add the follow blurb to an About the author section to every blogpost by Quinn Slack:

Quinn Slack is the CEO and co-founder of Sourcegraph, the code intelligence platform for dev teams and making coding more accessible to more people. Prior to Sourcegraph, Quinn co-founded Blend Labs, an enterprise technology company dedicated to improving home lending and was an egineer at Palantir, where he created a technology platform to help two of the top five U.S. banks recover from the housing crisis. Quinn has a BS in Computer Science from Stanford, you can chat with him on Twitter @sqs.

Why? Community would like there to be an About the author section to blogposts. Relevant PR: #5462. (#5513 (closed) will add this section to the Handbooks blog post instructions).