This almost works:

 1. this compiles
 2. we use the default latex template and the onion theme, no other  change

except:

 1. the logo is not scaled properly
 2. it shows up on every page!

I tried to change the size of the PNG, and it doesn't work. If I make
it bigger, it just scales bigger.

No idea why it shows up everywhere like this.

Taken from:

https://styleguide.torproject.org/brand-assets/

Specifically:

https://styleguide.torproject.org/static/images/tor-logo/color.svg

And converted with rsvg-convert color.svg > color.png