K-API feature: API listing of NSHM publications

[chrisbc]

AS Kororaa support team

we want to add, and modify the contents of publications without too much overhead.

Done when

• define a schema for publications (author, reviewer, bilblio refs , links etc
• API method reads data from a JSON file that we'll store in S3 (Same as used for Disaggregration reports & Markdown content)