One Subscription page for your plan and billing

Checking an invoice used to mean opening Plan for the numbers and Billing for the portal, and neither said when the next renewal was. The Subscription page answers it in one place: your plan and its status at the top, then one row per question, each with its action in the same column.

• What you pay: the monthly price, the seats billed against the seats counted today, and the renewal, trial or end date.
• Where your invoices go: the billing email and a link to the billing portal, or to GitHub for a Marketplace subscription.
• Why something is off: a payment that did not go through, more people counting as seats than you pay for, or a subscription on hold each get a notice that says what is affected and what fixes it. A failed payment never switches features off.
• What your plan does not cover: on an older per-product plan, the products you do not have are listed apart, with a way to ask about them. Every member of the organization sees the plan, its status and its usage. The price, invoices and cancellation stay with billing managers. The old Plan and Billing links still work and open the new page.