Add an alumni page

[Ukyeon]

No description provided.

[alexlenail]

Hi @Xiaojieqiu, @Ukyeon
Thanks for the PR. Could you use jekyll to make this page, rather than javascript? It would be nicer to have it statically built server-side. The people page can serve as a guide

In fact, the people page has an alumni page commented out already.

weissmanlab/_pages/people.html

Line 10 in 1216392

{% assign alums = site.data.people | where: "alum", "true" %}

Maybe copying "people.html" and removing the current members leaving only the alumni could be a good place to start?