[DOCS] Add Section for Google Summer of Code Fellows

[TheCedarPrince]

This new section should highlight the work done by past Google Summer of Code fellows! This is to both recognize their valiant efforts as part of the growing JuliaHealth ecosystem as well as to document what did and did not work well throughout their respective fellowships to help us improve as fellows and mentors. Excited we are getting to add this page in! 🎉