Use entity ID for sample question ID

I'm making a change in Metabase that will change the actual ID. Let's
use entity IDs, which are less likely to change.

Author: johnswanson

client/src/App.tsx

@@ -10,7 +10,7 @@ const config = defineMetabaseAuthConfig({
   metabaseInstanceUrl: import.meta.env.VITE_METABASE_INSTANCE_URL,
 });
 
-const questionId = 24;
+const questionId = "kgAiQ87dLKJmTnOaTeVsc";
 
 const theme = defineMetabaseTheme({
   // Specify a font to use from the set of fonts supported by Metabase.