Press Resources, list__links, and list__icons

Press Resources page still needs:
- [ ] Images
- [ ] Style tweaks
Ok, done. (Not yet pushed.) The only note I want to leave this thread on is that we should be mindful of the possibility of nested lists where we don't want `li`s farther down to inherit that styling. I don't think this should be an issue with the intended use of `.list__links` or `.list__icons`, but it might with `__unstyled`, `__spaced`, and `__horizontal`.