fix: open urls after serves, not before

prevents awkward 404s

build/fsfe_website_build/phase3/serve_websites.py

@@ -14,7 +14,7 @@ from pathlib import Path
 logger = logging.getLogger(__name__)
 
 
-def _run_webserver(path: str, port: int) -> None:
+def _run_webserver(path: Path, port: int) -> None:
     """Given a path and a port it will serve that dir on that localhost:port."""
     os.chdir(path)
     handler = http.server.SimpleHTTPRequestHandler
@@ -38,12 +38,13 @@ def serve_websites(
         for path in Path(serve_dir).iterdir()
         if (path.is_dir() and (path.name in site_names))
     )
-    serves: list[tuple[str, int]] = []
+    serves: list[tuple[Path, int]] = []
     for index, directory in enumerate(dirs):
         port = base_port + (increment_number * index)
-        url = f"http://127.0.0.1:{port}"
-        logger.info("%s served at %s", directory.name, url)
-        webbrowser.open(url + "/index.en.html")
-        serves.append((str(directory), port))
+        serves.append((directory, port))
     with multiprocessing.Pool(len(serves)) as pool:
-        pool.starmap(_run_webserver, serves)
+        pool.starmap_async(_run_webserver, serves)
+        for directory, port in serves:
+            url = f"http://127.0.0.1:{port}"
+            logger.info("%s served at %s", directory.name, url)
+            webbrowser.open(url + "/index.en.html")