Add pictures

[tsalo]

We need banner images, several member photos, and pictures for all of the projects, posters, presentations, etc.

[tsalo]

I'm not sure how to do this, but we need to downsample our poster pdfs so they'll load faster and won't take up as much space. We can access the high resolution versions through the HBM E-Posters or by putting our projects on the OSF, but we should keep low resolution versions locally for the pictures on the site. Anyone know the easiest way to do this?

[tsalo]

All photos/logos added.