Link posts / Linklog (john gruber style, similar to hpstr)

I think linklogs (john gruber style) are a great idea (especially to rid ourselves of the stranglehold of any *one* particular social network) for short commentary.

I've tried to implement it here for minimal-mistakes.

In addition to the mmistakes/hpstr-jekyll-theme way, I've also altered the ```post-index.html``` so that it includes the *complete* post with html and linebreaks intact. 

The complete post (not the linked url) can be reached by clicking on the timestamp.

Now, obviously, there is one huge problem: this looks pretty bad, and I have no design talent.

As a preliminary fix, I assigned link-posts a smaller headline, but I'm guessing they (and the timestamp or whatever) be designed better.

Still, here's a start.