The blog team member images are resized badly

Some team members do not have squared images and if we turn them into a circle (as blog post authors) they look funny:

<img width="219" alt="image" src="https://github.com/compiler-research/compiler-research.github.io/assets/6516307/53abf4d9-7928-4398-a721-9d3a3531089e">
