Added subscription management to billing

Author: clairekinde11

src/data/sidebarData.ts

@@ -162,6 +162,11 @@ const sidebarData = [
         autogenerate: {directory: "billing/payment-management"},
         collapsed: false
       },
+      {
+        label: "Subscription management",
+        autogenerate: {directory: "billing/manage-subscribers"},
+        collapsed: false
+      },
       {
         label: "Pricing",
         autogenerate: {directory: "billing/pricing"},