Updated Sphinx config to build docs in master branch.

docs/source/conf.py

@@ -18,7 +18,7 @@ import os, re, shlex, sys
 # If extensions (or modules to document with autodoc) are in another directory,
 # add these directories to sys.path here. If the directory is relative to the
 # documentation root, use os.path.abspath to make it absolute, like shown here.
-sys.path.insert(0, os.path.abspath('../../gprMax'))
+sys.path.insert(0, os.path.abspath('../..'))
 
 # -- General configuration ------------------------------------------------