added read-only mode + visual improvements

pages/api/v1/tokens/[id].ts

@@ -7,6 +7,12 @@ export default async function token(req: NextApiRequest, res: NextApiResponse) {
   if (!user) return;
 
   if (req.method === "DELETE") {
+    if (process.env.DEMO_MODE === "true")
+      return res.status(400).json({
+        response:
+          "This action is disabled because this is a read-only demo of Linkwarden.",
+      });
+
     const deleted = await deleteToken(user.id, Number(req.query.id) as number);
     return res.status(deleted.status).json({ response: deleted.response });
   }