move map file

demo/maps.html

@@ -51,7 +51,7 @@
 
     <script type="module">
       import { FolkGeometry } from '../src/canvas/fc-geometry.ts';
-      import { FolkMap } from '../src/maps';
+      import { FolkMap } from '../src/folk-map.ts';
 
       FolkGeometry.register();
       FolkMap.register();

demo/spreadsheet-propagator.html

@@ -166,7 +166,7 @@
     ></event-propagator>
 
     <script type="module">
-      import { FolkMap } from '../src/maps';
+      import { FolkMap } from '../src/folk-map.ts';
       import { FolkGeometry } from '../src/canvas/fc-geometry.ts';
       import { EventPropagator } from '../src/arrows/event-propagator.ts';
       import { SpreadsheetTable } from '../src/spreadsheet/spreadsheet.ts';