restructured docs: include apidoc support for module index, added copy of...

restructured docs: include apidoc support for module index, added copy of gallery and introduction of nifty1 docs, changed to rtd theme and bug fixes
4 jobs for sphinx_docs in 4 minutes and 27 seconds
Status Job ID Name Coverage
  Test
passed #176549
test_min

00:02:13

passed #176550
test_mpi

00:02:56

passed #176551
test_mpi_fftw

00:03:23

passed #176552
test_mpi_fftw_hdf5

00:04:27

52.0%