Jekyll does not support responsive images out of the box. There are plugins that can do that.
But unfortunately GitHub does not support any of them.
The Fix
Ben Seymour has written a post on making images responsive. I got his code to work with some slight modifications.
I created a shell script resize_image.sh to resize an image in my artifact directory and store them in the width buckets 600, 850 and 1200.
After resizing the image I only had to add these lines to make my images responsive. Note that I am not using the _config.yml like Ben since I did not want to modify the code in two places to add an image( The downside to that is having to modify in many places if I ever need to modify an image I have already added. Let’s hope that never happens)
