Rework compression for faster build

[limzykenneth]

astro-compress leaves too much possible performance on the table by not processing images concurrently. This version tries to do this as much as possible, one possible bottle neck is IO. Possible way to optimize this is through utilizing streams but will require temporary write location.

Better build console output would be needed as well.

[limzykenneth]

Build time decreased from last deployed 1180.74s to 788.50s in CI. About 461.65s on my computer. GitHub Actions likely don't provide as much processing power but it should make things a bit more speedy unless we ever want to use GitHub Actions build artifacts.