Add `summary` to `Education` entries

[heitorPB]

This allows us to describe briefly our Master's and PhD's thesis.

What do you think about this?

[joshuajaharwood]

Good idea. Just listing university modules doesn't tell a hiring manager much.

[JohnnyMarnell]

Came here to suggest same, e.g. to describe honors, notable projects, papers, activities. Are schema suggestions / discussions much active these days? @thomasdavis . Or pretty moot since themes would need to add back support...