Authors bio page

Something to recognise the authors of the articles. E.g. Actuaries Digital has about the authors at the end of each article.

The issue names no files, tests, or entry points to start from; first review the repository's article and author-content structure. Done should be an agreed author bio page with defined scope and a clear way to verify how it appears alongside articles.

索引モデルが issue の本文から書いたものです。