Add license sync functionality to customer portal

As per the mural flow here: https://app.mural.co/t/gitlab2474/m/gitlab2474/1565974114708/57946f67b893d799059f6bebb2fd5b60f3b21582

We need to decide on where to display license info in the customer portal and design the page. We should start with some loose mockups/sketches to show customers during research interviews to get their feedback.

@timnoah Is this something we could use Webflow for?