#7771609 Add Jetpack Mobile to header navigation

Proposed Changes

• This PR adds a link to Jetpack Mobile page to the header navigation on cloud.jetpack.com

Context: pbNhbs-51O-p2

Testing Instructions

• Checkout this branch locally
• Run yarn start-jetpack-cloud
• Visit http://jetpack.cloud.localhost:3000/pricing
• Make sure that the Products submenu looks like the screenshot below, and that it matches the proposed design (in the link above)
• Confirm that the link works, and the animation looks good

Pre-merge Checklist

• Has the general commit checklist been followed? (PCYsg-hS-p2)
• Have you written new tests for your changes?
• Have you tested the feature in Simple (P9HQHe-k8-p2), Atomic (P9HQHe-jW-p2), and self-hosted Jetpack sites (PCYsg-g6b-p2)?
• Have you checked for TypeScript, React or other console errors?
• Have you used memoizing on expensive computations? More info in Memoizing with create-selector and Using memoizing selectors and Our Approach to Data
• Have we added the “[Status] String Freeze” label as soon as any new strings were ready for translation (p4TIVU-5Jq-p2)?
• For changes affecting Jetpack: Have we added the “[Status] Needs Privacy Updates” label if this pull request changes what data or activity we track or use (p4TIVU-ajp-p2)?