Remove func module

func module has been migrated to a new package metafold-graph available
at private repo metafold/lce>. Note the Python package is publicly
available from a package registry on request.

Author: rycwo

contrib/draw_graph.py

@@ -46,14 +46,6 @@ metafold.client module
    :members:
    :show-inheritance:
 
-metafold.func module
---------------------
-
-.. automodule:: metafold.func
-   :members:
-   :undoc-members:
-   :show-inheritance:
-
 metafold.exceptions module
 --------------------------