Better media/zoom/documentation (emoji, pfp, server and post icon)

In Chrome u can zoom in 500%, in discord only 200%

200%: emoji are max 96p, pfp 160p, server pic 200p, post icon is 144p.

500%: emoji are max 240p, pfp 400p, server pic 500p, post icon is 360p.

Recommended: emoji are 108p, pfp 128p, server pic 512 minimal, post icon: none

If u can do math, u see that this doesn't make sense at all.

It's also a shame svg aren't supported as emoji or post icon, while native emoji svg and webp are supported.