Remove current station as destination

src/main.rs

@@ -169,6 +169,10 @@ async fn route_station_overview(
     out.push_str("<ul>\n");
 
     for (dest_station_id, dest_station) in state.stations.into_iter() {
+        if dest_station_id == station_id {
+            continue;
+        }
+
         out.push_str(&format!("<li><a href=\"/station/{}/to/{}\">{}</a></li>\n", station_id, dest_station_id, dest_station.name));
     }