Data curation exploration

[jadudm]

Submitting this as a draft PR for reference. Branch render.

This PR provides exemplars of several things that may be of use/interest in the future.

1. It provided draft text regarding data curation, including a draft process that would include our advisory committee and OMB.
2. A framework for creating individual data issue files (largely templated) for documenting data curation concerns. Five known concerns are documented using this format as an example.
3. An associated RSS/Atom feed for data concerns, so partner agencies and the public can subscribe to notices about data concerns as they are found/documented.
4. A framework for documenting data curation actions (again, templated) so that fixes can be communicated/documented in a standard way.
5. An associated RSS/Atom feed for curation actions.
6. The branch demonstrates how our updates page could be converted to individual files, the updates page could be automatically generated from those files, and an RSS and Atom feed generated from those updates. (Example RSS feed)

The curation process may be of interest as the starting point for an ADR regarding how to curate data in a manner that is transparent and maintains the trust of our partner agencies as well as the public.

Offered as a draft for reference only; it can be closed as "not planned" as work proceeds elsewhere.