Add Anyscale logo and quote to /cloud-beta

Created by: marybelzer

Context We have one beta customer, Anyscale, who just agreed to let us use a quote from them + their logo.

Request: Add the logo + quote at the top right of /cloud-beta While we’re at it, make small tweaks to the copy at the top of that page

Resources 🖇️Customer logo (attached) 💬 Quote: "Sourcegraph makes it so much easier to onboard to large codebases. It's an absolute game changer when it comes to navigating around an ecosystem with hundreds of repositories or even multiple organizations." 🔗Copy doc for copy edits (January 10th version)