[hoanle0126]

• Promote ExecuteDriver.Result to a class-level inner class on ExecuteDriver and annotate execute_driver with -> 'ExecuteDriver.Result' (resolving # TODO Inner class case).
• Fix the Usage code block indentation in ScreenRecord.stop_recording_screen so Sphinx builds without docutils errors.
• Exclude TypeVar T and the internal webdriver.mobilecommand module from generated Sphinx API docs, add :no-index: on the package-level webdriver re-export section to avoid duplicate cross-reference warnings, and replace the sphinx-quickstart placeholder in docs/index.rst.

Refs #529