view data fixes

apps/website/lib/view-data/LeagueMembershipsViewData.ts

@@ -0,0 +1,9 @@
+import type { LeagueMemberViewData } from './LeagueMemberViewData';
+
+/**
+ * ViewData for LeagueMemberships
+ * This is the JSON-serializable input for the Template.
+ */
+export interface LeagueMembershipsViewData {
+  memberships: LeagueMemberViewData[];
+}