We've not been using this for long since we introduced the tox targets for doc lint and build. Also remove .gitignore in the subdirectory to maintain ignored files in a single place. Change-Id: I6becc9b0f6f7308d12bc82944f786474421362a4 Signed-off-by: Takashi Kajinami <kajinamit@oss.nttdata.com>