Added nblicent to docs

Author: palewire

_data/documentation.yml

@@ -28,6 +28,7 @@ Widgets:
 
 Notebook Documents:
   nbconvert: https://nbconvert.readthedocs.io/en/latest/
+  nbclient: https://nbclient.readthedocs.io/en/latest/
   nbformat: https://nbformat.readthedocs.io/en/latest/
   nbviewer: https://github.com/jupyter/nbviewer/