icons on people page should have either ARIA labels or be restructured

[Inkering]

part of a series of accessibility improvements//maintenance taeyoon asked me to work on, I'm going to sort through and make PR's for these where possible

On the grid-based people page, each link section for each person could benefit a text label describing the role of the link icon beyond the url.

https://github.com/SFPC/sfpc.github.io/blob/0b33442b3218f508950d7bde269d40c008e25932/_layouts/people.html#L40-L55