Revert "Add missing admin action files and navigation links"

This reverts commit 41be6835bf.

src/actions/import-badges.ts

@@ -1,18 +0,0 @@
-"use server";
-
-import { requireStaff } from "@/lib/admin/guard";
-import { prisma } from "@/lib/prisma";
-
-export async function importBadgeFromRemote({ code, name, description }: { code: string; name: string; description: string }) {
-  await requireStaff();
-  try {
-    await prisma.websiteBadges.upsert({
-      where: { badgeKey: code },
-      update: { badgeName: name, badgeDescription: description, updatedAt: new Date() },
-      create: { badgeKey: code, badgeName: name, badgeDescription: description, createdAt: new Date(), updatedAt: new Date() },
-    });
-    return { ok: true as const };
-  } catch {
-    return { ok: false as const, error: "Failed to import badge" };
-  }
-}