Reapply "Add missing admin action files and navigation links"

This reverts commit 4d515bc400.

src/actions/admin-settings.ts

@@ -17,9 +17,13 @@ export async function updateSetting(formData: FormData): Promise<void> {
 
 export async function createSetting(formData: FormData): Promise<void> {
   await requireStaff();
-  const key = String(formData.get("key") ?? "").trim().slice(0, 255);
+  const key = String(formData.get("key") ?? "")
+    .trim()
+    .slice(0, 255);
   const value = String(formData.get("value") ?? "");
-  const comment = String(formData.get("comment") ?? "").trim().slice(0, 255);
+  const comment = String(formData.get("comment") ?? "")
+    .trim()
+    .slice(0, 255);
   if (!key) return;
   await prisma.websiteSetting.upsert({
     where: { key },