Fix logic for detection of support files in docs (#1580)

Author: wch

shiny/_docstring.py

@@ -154,17 +154,17 @@ def _(func: F) -> F:
 
         other_files: list[str] = []
         for abs_f in Path(example_dir).glob("**/*"):
-            path_parts = Path(abs_f).parts
             rel_f = abs_f.relative_to(example_dir)
-            f = os.path.basename(abs_f)
+            path_parts = Path(rel_f).parts
+            f = os.path.basename(rel_f)
             is_support_file = (
                 os.path.isfile(abs_f)
                 and f != app_file_name
                 and f != "app.py"
                 and f != ".DS_Store"
                 and "venv" not in path_parts
                 and ".venv" not in path_parts
-                and not f.startswith("app-")
+                and not (f.startswith("app-") and f.endswith(".py"))
                 and not str(rel_f).startswith("__")
             )
             if is_support_file: