nixos-render-docs: header and footer as list[str]

    _links_in_last_description: Optional[list[str]] = None

    def __init__(self, revision: str,

                 header: Path | None,

                 footer: Path | None,

                 header: list[str] | None,

                 footer: list[str] | None,

                 *,

                 # only for parallel rendering

                 _options_by_id: Optional[dict[str, str]] = None):

        result = []

        if self._header is not None:

            with self._header.open() as f:

                result += f.read().splitlines()

            result += self._header

        else:

            result += [

                r'''.TH "CONFIGURATION\&.NIX" "5" "01/01/1980" "NixOS" "NixOS Reference Pages"''',

            result.append(".RE")

        if self._footer is not None:

            with self._footer.open() as f:

                result += f.read().splitlines()

            result += self._footer

        else:

            result += [

                r'''.SH "AUTHORS"''',

            f.write(md.finalize())

def _run_cli_manpage(args: argparse.Namespace) -> None:

    header = None

    footer = None

    if args.header is not None:

        with args.header.open() as f:

            header = f.read().splitlines()

    if args.footer is not None:

        with args.footer.open() as f:

            footer = f.read().splitlines()

    md = ManpageConverter(

        revision = args.revision,

        header = args.header,

        footer = args.footer,

        header = header,

        footer = footer,

    )

    with open(args.infile, 'r') as f: