Support for sharp integration and image resizing

[holly-cummins]

I've started thinking about what would be needed to dogfood http://quarkus.io and http://quarkus.io/extensions onto roq. It's not an easy lift, because there's a lot of javascript code in the extensions backend, and lots of Jekyll + Ruby code in the main site. One gap is image support. The http://quarkus.io/extensions site uses the [Gatsby image plugin](https://www.gatsbyjs.com/plugins/gatsby-plugin-image/. It supports responsive images by preparing (at build time) versions of images at various sizes. The other half is a web component (a React component, in the Gatsby case) which includes the most appropriate size of the image into the html. It also has different code paths and options for static and dynamic images.

[ia3andy]

quarkiverse/quarkus-web-bundler#42