Add US Letter Page Size snippet

[ericscheid]

Your idea:

The default page size is US Letter, but the average new user shouldn't be expected to know that.

/* US Letter Page Size */
.page {
	width  : 215.9mm; /* 8.5in */
	height : 279.4mm; /* 11in */
}

This is a low priority issue, perfect for a new contributor or anyone during Hacktober.
Solution found = duplicate the existing A4 snippet code and substitute in the css above.

[5e-Cleric]

Even if they don't know that, this still doesn't make any sense, a user that doesn't know the page is letter size and tries this snippet, will complain it doesn't work because the page size doesn't change!

Nevermind, forgot it was my own intention to change the default page size to a selectable thing. Go on.