feat: qa round 2 performance

[tikagan]

• all <img> elements lazy load by default
• images that are part of card contents loaded as <img> elements, not background-image
• card component generates alt text for images based on file name
• image files renamed for alt text
• open panda project card sidebar image replaced with correct high contrast image

Ticket AU-2753

[tikagan]

@tjsMck if you want to take a look that all the images are still loading correctly (I checked but it doesn't hurt to double check) that would be great. Let @orvn still merge this PR though because of the lazy image loading

[orvn]

Looks good. I think we can keep the lazy loading, although I don't love it, because when I scroll too fast it feels like the page takes a while to load/is still loading. This might be an issue with slower latency from Fleek though. So let's keep it and then discuss more lazy loading strategy in a dev standards at some point.