issue #56 Remove ignored files in docs

docs/_build/doctrees/duniterpy.api.bma.doctree

docs/_build/doctrees/duniterpy.api.doctree

docs/_build/doctrees/duniterpy.doctree

docs/_build/doctrees/duniterpy.documents.doctree

docs/_build/doctrees/duniterpy.grammars.doctree

docs/_build/doctrees/duniterpy.key.doctree

docs/_build/doctrees/environment.pickle

docs/_build/doctrees/index.doctree

docs/_build/doctrees/modules.doctree

docs/_build/html/.buildinfo

docs/_build/html/_sources/duniterpy.api.bma.rst.txt

docs/_build/html/_sources/duniterpy.api.rst.txt

docs/_build/html/_sources/duniterpy.documents.rst.txt

docs/_build/html/_sources/duniterpy.grammars.rst.txt

docs/_build/html/_sources/duniterpy.key.rst.txt

docs/_build/html/_sources/duniterpy.rst.txt

docs/_build/html/_sources/index.rst.txt

docs/_build/html/_sources/modules.rst.txt

docs/_build/html/_static/ajax-loader.gif

docs/_build/html/_static/alabaster.css