WebHost: Fix docs generation from a .apworld (#1862)

zfile.filename is the full path within the archive, so by default
zf.extract will maintain that directory structure when extracting.

This causes the docs to be placed in the wrong place, as the Javascript
code expects them to be placed directly in the game folder.

WebHost.py

@@ -74,6 +74,7 @@ def create_ordered_tutorials_file() -> typing.List[typing.Dict[str, typing.Any]]
             with zipfile.ZipFile(zipfile_path) as zf:
                 for zfile in zf.infolist():
                     if not zfile.is_dir() and "/docs/" in zfile.filename:
+                        zfile.filename = os.path.basename(zfile.filename)
                         zf.extract(zfile, target_path)
         else:
             source_path = Utils.local_path(os.path.dirname(world.__file__), "docs")