Fix: Logo and icon

[wolterkam]

Problem

Sable is not a bird.

Solution

Built with Affinity. I have put the working file with all the artboards inside of the new /design directory.

I've made favicons and PWA tiles for both light and dark mode, but didn't implement any sort of switching in this commit, so whatever was already there at the moment was replaced with variants of the dark mode icons. Nah, let's go all dark with favicons.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings