updated sphinx howto

docs/howto.txt

+Required packages:
+sphinx
+numpydoc
+sphinx_rtd_theme
+
+
+#Two step creation of webpages:
+
+sphinx-apidoc -l -e -d 3 -o docs/source/mod/ nifty/ nifty/plotting/ nifty/spaces/power_space/power_indices.py nifty/spaces/power_space/power_index_factory.py nifty/config/ nifty/basic_arithmetics.py nifty/nifty_meta.py nifty/random.py nifty/version.py  nifty/field_types/ nifty/operators/fft_operator/transformations/rg_transforms.py
+
+
+#creates all .rst files neccesary for ModuleIndex excluding helper modules
+
+sphinx-build -b html docs/source/ docs/build/
+
+#generates html file and build directory

docs/howtogenerate.txt

-Two step creation of webpages:
-
-sphinx-apidoc -l -e -d 3 -o sphinx/source/mod/ nifty/ nifty/plotting/ nifty/spaces/power_space/power_indices.py nifty/spaces/power_space/power_index_factory.py nifty/config/ nifty/basic_arithmetics.py nifty/nifty_meta.py nifty/random.py nifty/version.py  nifty/field_types/ nifty/operators/fft_operator/transformations/rg_transforms.py
-
-
-creates all .rst files neccesary for ModuleIndex excluding helper modules
-
-sphinx-build -b html sphinx/source/ sphinx/build/
-
-generates html filel amd build directory