Project idea: Update the Tor Project's brand mark

The current Tor logo is iconic, but the onion is a little dated, and more importantly it displays poorly at small sizes. This is unfortunate, because in contexts where a smaller icon is required (like our websites' favicon, for example) the current practice is to use the onion on its own.

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

However we can update the onion to work better in small sizes while still preserving what makes the Tor logo so recognizable. It would also be a good opportunity to update and simplify the colors used in the logo to match those we're developing for the new style guide.