Adding alumni table widget

[patrik-bartak]

Add widget that allows for formatting members in a table as alumni

[mitchellolsthoorn]

As a reference and starting point, you can use the following file: https://github.com/wowchemy/wowchemy-hugo-themes/blob/main/wowchemy/layouts/partials/widgets/people.html

This file needs to be adapted to use a table format using the Bootstrap v4 table styles.

For the columns, we can use the same values as the old website:

• Name (link to author page)
• Period
• Role
• Current Affiliation