Haha classic <a href="http://i.imgur.com/kzza281.gifv" rel="nofollow">http://i.imgur.com/kzza281.gifv</a><p>Might wanna spend more than a few hours.
It's cool that you made an experiment here, but I wanted to say that whenever I see people hosting blogs with expensive software (NodeJS with Express, or a PHP CMS, or other complete stack) I think it will be complicated to host those things forever, so probably the content will vanish some time in the near future. This could apply to experimental setups also, but perhaps experimental people are totally different from people that use the same tools for all kinds of jobs and will perhaps be able to migrate their data from the experimental tools if they prove to not be as good as first imagined.
Pretty cool idea to use git-back! However I can recommend React for your MV* framework and I guess you can use disqus for your comments and save yourself from comment spam on your github repo!
I'd add an RSS feed at a minimum, and probably email/twitter notifications as well.
I'm not going to check your blog daily, but I would add you to my feed reader.