Clean up hyperlinks to the wiki

Created by: seancolsen

This guide has lots of hyperlinks which point to the wiki. Many of these links should actually point to this guide, or other guides.

I think we should do this with an automated process, because designing one would be useful for other guides (and future projects as well).

1. Use a regex to extract external hyperlinks from the markdown (all external hyperlinks, not just wiki ones)
2. For each hyperlink, see if the URL responds with an HTTP redirect
3. If so, modify markdown with the new redirect.

At this point I think the work of creating a script which performs the above tasks will be faster than the work of manually fixing all those URLs.