Fix the links

[NotRichardNixon]

This is a minor issue, but right now, getting the link of xkcd 2354 returns https://www.xkcd.com/2354, even though the www. is superfluous. The url you get by going to the xkcd site is just https://xkcd.com/2354. This doesn't really matter, except that it (again) messes up the discord links by a tiny bit. The only reason I bring it up is that it should be an easy fix and it makes the link function better.