feat: add references and volunteer community sections with detailed content

app/about/references/page.tsx

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+import { ReferencesDetailContent } from "@/components/references-detail-content";
+
+export default function AboutReferencesPage() {
+  return <ReferencesDetailContent />;
+}

app/about/volunteer-community/page.tsx

@@ -0,0 +1,5 @@
+import { VolunteerCommunityContent } from "@/components/volunteer-community-content";
+
+export default function AboutVolunteerCommunityPage() {
+  return <VolunteerCommunityContent />;
+}