Revert "[doc] Attempt to fix autodoc on readthedocs"

This reverts commit c05bf86.

it didn't work, looks like the problem is pyutilib missing, requirements
file not working right on readthedocs

doc/conf.py

@@ -19,7 +19,7 @@
 # If your extensions (or modules documented by 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.append(os.path.abspath('..'))
+#sys.path.append(os.path.abspath('.'))
 
 # General configuration
 # ---------------------