`.webp` automation for better page loads

[matt-yml]

goals

• consume less bandwidth
• speed
• flexibility - accept more image import types
• reduce time spent maintaining motd
• reduced dependence on unreliable image repo updates

public version of https://github.com/matt-yml/gore/issues/540

[matt-yml]

https://github.com/matt-yml/gore/issues/557
https://github.com/matt-yml/gore/issues/558