fix singleton layout

app.py

@@ -189,8 +189,8 @@ for i in range(len(node_info.index)):
         layout_x = layout[node["gene_index"]][0] * 600 + 1500/2
         layout_y = layout[node["gene_index"]][1] * 600 + 1500/2
     else:
-        layout_x = (singleton_index % 10) * 150
-        layout_y = np.floor(singleton_index / 10) * 50 + 200
+        layout_x = (singleton_index % 8) * 150 + 100
+        layout_y = np.floor(singleton_index / 8) * 50 + 200
         singleton_index += 1