feat: Move manage billing button to billing page

adminsite/components/InstanceRecord.tsx

@@ -5,7 +5,6 @@ import clsx from "clsx";
 import { useMutation, useQuery, useQueryClient } from "@tanstack/react-query";
 import { useEffect, useState } from "react";
 import { api, type Instance, type License } from "@/lib/api";
-import { ManageBillingButton } from "@/components/ManageBillingButton";
 import { daysRemaining, formatDate, licenceState, limitLabel } from "@/lib/format";
 import { StatePill } from "./StatePill";
 import { Button, LinkButton } from "./Button";
@@ -195,8 +194,6 @@ export function InstanceRecord({ instance, license, reapAfterDays, defaultOpen =
                             {renew.isPending ? "Renewing…" : "Renew"}
                         </Button>
                     )}
-
-                    {instance.tier && instance.tier !== "free" && <ManageBillingButton />}
                 </div>
             </div>
         </article>