Carousel Swiper.js integration

Currently the Jetpack carousel is using the Swiper.js library to provide the slider functionality. In order to reduce the bundle size of this library a custom build is used.

How to generate a new custom build

• Check out the https://github.com/Automattic/swiper repo
• Switch to the jetpack-build branch and follow the instructions on the readme

ToDo

• Automate this process somehow