Sloped Ground documentation

The Sloped Ground algorithm is implemented, see !183 (merged).

The documentation needs to be updated and included in the SunPeek doc. We decided to do this after merging !183 (merged).

ToDos

• [PZ] Update sketchup plots
• [PO] Include output plots from tests in Word file
• [PZ] Finalize text / method description in Word file
• [PZ] Convert Word file to RST and include in SunPeek documentation