new NAAN registry stats page

[John Kunze]

As part of a very soft rollout/evaluation, please have a look at and share your thoughts on a new page showing a breakdown of the NAAN registry:

     https://arks.org/naan/stats/

This page and the javascript that powers its interactive charts were contributed by Bob Coret of the National Library of the Netherlands.

The data is purely drawn from the NAAN registry. It would be great if among our working members we could come up with a nice integration with the simple search interface and graph at 

    https://cdluc3.github.io/naan_reg_priv/

Feel free to volunteer to help us think through (and implement) an integration! :)