Properly support A4 Résumés

[randytarampi]

Related to #6 & #7, but I'd like to get this one done earlier than those two.

There's something going on with how puppeteer scales the page down for printing that forces it to go down to a small breakpoint for A4.

I can either change the small breakpoint itself or figure out how to force puppeteer to use a different pixels-per-inch value in its scaling calculation.

Or something.

[randytarampi]

I probably should've noted that the pixels-per-inch value here was 72, so US Letter (8.5" x 11") would be just over the small-screen breakpoint at 612px, while A4 (8.27" x 11.7") would be just below it at 595px, hence the 6px bump in 5141d96.