Track page views in GA on click

I noticed that the html redirect was taking way too long. It seems that
it is loading and rendering the whole page before redirecting, which is
a terrible shame.

The tradeoff here is that I'm breaking
calebthompson.io/whatever-external-post links. I may bring that back
eventually.

* Reverting back to linking to external urls
* Add javascript onclick to external links to track the local path.
* Remove redirect layout
Grab content for external posts