Enhancement: Use "raise Exc from e" syntax when re-raising exceptions

[USSX-Hares]

pdoc/pdoc/__init__.py

Lines 227 to 232 in f8704ec

	try:
	module = importlib.import_module(module_path)
	except Exception as e:
	msg = f'Error importing {module!r}: {e.__class__.__name__}: {e}'
	if not skip_errors:
	raise ImportError(msg)

Change raise ImportError(msg) to raise ImportError(msg) from e:

    try:
        module = importlib.import_module(module_path)
    except Exception as e:
        msg = f'Error importing {module!r}: {e.__class__.__name__}: {e}'
        if not skip_errors:
            raise ImportError(msg) from e

This improves exceptions readability.

I didn't search for other places in the repository, there're probably more places where raise x from y would be useful.