Remove build files from remote.

docs/_build/html/_static/css/fonts/lato-normal.woff2

docs/_build/html/_static/css/theme.css

docs/_build/html/_static/doctools.js

docs/_build/html/_static/documentation_options.js

docs/_build/html/_static/file.png

docs/_build/html/_static/jquery-3.5.1.js

docs/_build/html/_static/jquery.js

docs/_build/html/_static/js/badge_only.js

docs/_build/html/_static/js/html5shiv-printshiv.min.js

docs/_build/html/_static/js/html5shiv.min.js

docs/_build/html/_static/js/theme.js

docs/_build/html/_static/language_data.js

docs/_build/html/_static/minus.png

docs/_build/html/_static/plus.png

docs/_build/html/_static/pygments.css

docs/_build/html/_static/searchtools.js

docs/_build/html/_static/underscore-1.3.1.js

docs/_build/html/_static/underscore.js

docs/_build/html/genindex.html

docs/_build/html/index.html