Readme: remove sphinx and breathe from dependencies

README.md

@@ -99,8 +99,6 @@ Depending on your system configuration, there will be more packages necessary to
 | Software | Version/Branch | Comments |
 | ---------| -------------- | -------- |
 | [doxygen](http://www.stack.nl/~dimitri/doxygen/) | | Builds documentation
-| [Sphinx](http://www.sphinx-doc.org/en/stable/) | | Builds documentation
-| [Breathe](https://github.com/michaeljones/breathe) | | Builds documentation
 | [METIS](http://glaros.dtc.umn.edu/gkhome/views/metis) | 5 | For parallel runs
 | [ParMETIS](http://glaros.dtc.umn.edu/gkhome/views/metis) | 4 | For parallel runs
 
@@ -138,11 +136,6 @@ These instructions are suitable for a clean **Ubuntu** or **Mac OS X** setup. Th
 
     **Parallel runs without these two packages are possible but not supported!**
 
-2. Install the necessary Python packages using `pip`:
-        
-        pip3 install --upgrade pip
-        pip3 install sphinx breathe
-
 3. **Mac OS X** only: 
     The Apple Clang compiler shipped with CMake is not suitable for compiling DORiE. Before proceeding, call