Redirect /mysterybox to Ceros page

Created by: elzannewentzel

Stakeholders: Fabi + Jake - no need to review What?: Redirect about.sourcegraph.com/mysterybox to Ceros piece https://view.ceros.com/sourcegraph/mysterybox/p/1 Why?: We're going to send that link to customers as part of a campaign. They will type the link about.sourcegraph.com/mysterybox and will be redirected to https://view.ceros.com/sourcegraph/mysterybox/p/1

Complete before Tuesday, July 19 Asana: https://app.asana.com/0/1200095757619647/1202540709729230/f