Initialize Sphinx documentation

Initialize Sphinx documentation

html_static_path setting was manually commented out to silence
a warning from Sphinx.

doc/sphinx/make.bat generated by sphinx-quickstart was removed.

Verify using doc/Makefile.

Generated using docker image from previous commit:
  cd doc/
  docker run --rm=true --user `id -u $USER`:`id -g $USER` -v $PWD:/doc \
   --name=muxpi-doc-container -it -a stdin -a stdout muxpi-doc-image \
   sphinx-quickstart --quiet --sep --project="MuxPi" --no-batchfile \
   --author="Samsung Electronics Co., Ltd" -v 0.0.1 sphinx

Change-Id: I8ee45d663b4c59af4b770a0b5bae431222b1c191
Signed-off-by: Alexander Mazuruk <a.mazuruk@samsung.com>