I had no idea people would want to do this. It turned out it was a simple matter of adding "user-scalable=yes". I regenerated the site and you should be able to zoom in now.
I didn't either, until I went through a time when I used mobile as my dominant reading platform. Screen size relative to eyeball acuity and or just a desire for scale drives it, for what that is all worth.
No worries. That you took a look at it counts. And please. I love your work and feel an apology is too much! I wrote poorly, with "this site" supposed to mean Hacker News"... Ah well.
Please take my appreciation with you into the holidays!