Move sources of the 'Sphinx' documentation.

	renamed:    doc/source/api/index.rst -> doc/api/index.rst
	renamed:    doc/source/api/titi_module.rst -> doc/api/titi_module.rst
	renamed:    doc/source/conf.py -> doc/conf.py
	renamed:    doc/source/index.rst -> doc/index.rst
	renamed:    doc/source/intro.rst -> doc/intro.rst