Reorganize documentation

Start to reorganize the documentation cleaning parts that should not be here.

  modified:   doc/conf.py.in
  renamed:    doc/index.rst -> doc/contents.rst
  renamed:    doc/cthyb_matrix.rst -> doc/algorithm.rst
  renamed:    doc/dmft/plot.py -> doc/plot.py
  renamed:    doc/dmft/single_site_bethe.h5 -> doc/single_site_bethe.h5
  renamed:    doc/dmft/single_site_bethe.py -> doc/single_site_bethe.py
  renamed:    doc/dmft/dmft.rst -> doc/dmft.rst
  new file:   doc/install.rst
  new file:   doc/authors.rst
  new file:   doc/bugs.rst
  new file:   doc/ctqmc1.bib
  new file:   doc/ctqmc2.bib
  new file:   doc/ctqmc3.bib
  new file:   README.txt
  deleted:    doc/ipt/
  deleted:    doc/manipulate.py
  deleted:    doc/operators.rst
  deleted:    doc/hubbardI.rst