self-host all static content

[Nemo157]

Currently we use some libraries hosted on cdnjs (run by Cloudflare)

docs.rs/templates/base.html

Lines 12 to 17 in 664577a

	<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/pure/0.6.0/pure-min.css" type="text/css"
	media="all" />
	<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/pure/0.6.0/grids-responsive-min.css"
	type="text/css" media="all" />
	<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.6.3/css/font-awesome.min.css"
	type="text/css" media="all" />

This has caused issues at least once. To reduce our points of failure it might be worth self-hosting these files.

[pietroalbini]

Yeah, I'd go for it.

[jyn514]

Implemented in #981

[Kixiron]

We still don't self-host everything, but it did drastically reduce what we don't. hightlight.js (js, css) are still not self-hosted, but they're more additive and aren't critical to site functionality