refactor: modularize browser client

src/server/page-template.ts

@@ -1,4 +1,4 @@
-import { APP_STYLES, CLIENT_SCRIPT } from "./app-assets.js";
+import { APP_STYLES } from "./app-assets.js";
 
 export function htmlPage(): string {
   return `<!doctype html>
@@ -154,9 +154,7 @@ ${APP_STYLES}
     </div>
 
     <script src="https://unpkg.com/leaflet@1.9.4/dist/leaflet.js" integrity="sha256-20nQCchB9co0qIjJZRGuk2/Z9VM+kNiyxNV1lvTlZBo=" crossorigin=""></script>
-    <script type="module">
-${CLIENT_SCRIPT}
-    </script>
+    <script type="module" src="/client/app.js"></script>
   </body>
 </html>`;
 }