f you use WakaTime to track your coding activity. You can add that to your README as a bar graph or embed it in your blog/portfolio. Just add this action to any of your repositories and there you have it.
As you would have guessed by now, this blog is created using one such awesome SSG named Pelican. Pelican is simple, customizable and offers lots of themes and plugins. Pelican is python based SSG and is available through pip.