add support for hiding venues from /lokaler

web/src/app/lokaler/page.tsx

@@ -33,6 +33,7 @@ const VenueFragmentDefinition = graphql(`
       ...Image
     }
     showAsBookable
+    showInOverview
     floor
     preposition
     usedFor
@@ -65,6 +66,7 @@ export default async function Page() {
   const { data, error } = await getClient().query(venueIndexQuery, {});
   const index = (data?.index ?? []) as VenueIndexFragment;
   const venues = (data?.venues ?? []) as VenueFragment[];
+  const visibleVenues = venues.filter((x) => x.showInOverview);
 
   return (
     <main className="site-main" id="main">