how to convert images to webp

• In order to keep chti.octo.com as small as possible, images must be in webp format and well sized.

1. Install cwebp
2. Copy-paste webp-convert.sh where you add new images
3. Or use directly command-line :

 cwebp -resize 300 300 great_place_to_work_2021.png -o great_place_to_work_2021.webp