Moved libs versions and hashes to `_config.yml`. Fixes #2067. Deferring everything possible to keep pages loads fast. --------- Signed-off-by: George Araújo <george.gcac@gmail.com>
Image slider with [Swiper](https://swiperjs.com/).  Image comparison slider with [img-comparison-slider](https://img-comparison-slider.sneas.io/).  --------- Signed-off-by: George Araújo <george.gcac@gmail.com>