The code and frontend setup of this website is available on Github. It uses quite some stuff that I wanted to check out for automated site content and code generation.
I use Jekyll as a website / pages generator. Jekyll let's you easily generate webpages with Markdown or HTML and a templating language.
The Responsive SASS framework is included as a Git submodule. I only use it's simple responsive grid mixins. Compared to Bootstrap it doesn't add the visual styles and it's easy to just use parts of it through SASS. The submodule system allows me to not have to include the entire framework in my repository and to easily benefit from updates.
For responsive images I'm using the <picture> polyfill and
through reading I've noticed that with a combination of
sizes attributes you get the best responsive image results. Images are
then chosen based on viewport size, screen resolution and the width of the image component.