Reduce image sizes

[yannickwurm]

• @gabrielluishernandez 's headshot is 20x bigger than it needs to be
• First I thought that most images could do with being reencoded as webp or similar. [Altho Macs running an OS that is more than 2 years old do not yet support Webp]... Given our users often have years-old computers, I think we should refrain from reencoding for now

[yuriigr]

In fact you can use <picture> object with .webp image and .png, .jpg.. fallback

[yannickwurm]

Ah that's cool. I didn't know about picture. Should I run imagemagick to convert everything to webp?

[yuriigr]

If you want to. Or maybe for large images only, it's up to you.

[yannickwurm]

(Btw - I'm happy for you to do these things)

[yuriigr]

What images do we need to "rework" ?