DOCS: Update information in AUTHORS.rst (#167)

* Link to contributor's page and update John email with github page

* replace John email with github page

* Restore John full name

Co-authored-by: Genevieve Buckley <30920819+GenevieveBuckley@users.noreply.github.com>

Co-authored-by: Genevieve Buckley <30920819+GenevieveBuckley@users.noreply.github.com>

AUTHORS.rst

@@ -5,9 +5,9 @@ Credits
 Development Lead
 ----------------
 
-* John Kirkham <kirkhamj@janelia.hhmi.org>
+* John Kirkham `@jakirkham <https://github.com/jakirkham>`_
 
 Contributors
 ------------
 
-None yet. Why not be the first?
+See the full list of contributors `here <https://github.com/dask/dask-image/graphs/contributors>`_