Use WEBP images to make things faster #509
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These were converted at 20% quality: $ convert -quality 20 @ @.20pc.webp 20% quality seems plenty for these (the quality is still pretty good) and as these are used behind a title and a colour gradient this seems likely to be completely fine for most usages.
Relies on the user having installed ImageMagick.
These images were all created using the script introduced previously.
These photos of individuals are fairly large files for what they are, so making the available in WEBP should save visitors some download size. Created with the same script introduced previously.
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This moves some of the heavier images, mostly on the homepage to support WEBP where browsers can do so. Along the way it introduces helpers for working with multiple images (by size and those with WEBP) and establishes a conventions for derived WEBP images' names.
Fixes #382
Size savings checked by eyeballing the local sizes plus checking
.currentSrcon the DOM nodes.https://pagespeed.web.dev/analysis/https-studentrobotics-org/k3zp02z6p1?form_factor=mobile was my starting point for where we can get benefits.