The .svg is 23KiB large, which adds quite a lot once you add up how
many pages are output for our Jekyll site. Each of the 2000 package
pages is only about 50KiB at most, so adding 23KiB to > 2000 .html
files results in almost 100MiB of space, just for the header image.

By moving from including the svg source via Jekyll to using an <img>
tag, we save about 100MiB for free, and the browser will still cache the
.svg just fine.