Refactor /about page to use text instead of images.

[sevko]

On large screens, the about page's images will move out of their section quickly enough to become visible further down/up the page (in another section, where the image has already receded).

[earwig]

The images get blurry on large screens, which is pretty ugly and especially noticeable because they contain text rather than pictures. I wonder if we can use SVGs or not even images at all (i.e. put their text in HTML and use CSS transformations to give the perspective effects).