Include coordinated and infrastructure package contributors in team page (was affiliated)

This page should include a list of affiliated package contributors (we need to decide whether to duplicate names already in the list of core contributors):

http://www.astropy.org/about.html

从 http://www.astropy.org/about.html 的 About 页面开始，确定相关软件包贡献者信息维护在哪里。确认已经列为核心贡献者的姓名是否应重复列出，然后更新团队页面，使其中包含已达成一致的贡献者列表。

由索引模型根据 Issue 内容生成。