feat: add unified favicon

[ChristianMurphy]

Adds an icon based off

converted using convert unified.png -define icon:auto-resize=64,48,32,16 favicon.ico

Here's how the icon looks in firefox and chrome:

[wooorm]

It gets pretty small; what do you think of using just the blue u as a favicon?

[ChristianMurphy]

Just the U could work

[Murderlon]

Cool cool. You might want to use something like https://favicon.io/ for different sizes and cross browser support.

[wooorm]

@danoszz Could you use your magic-fu to do something similar to get-alex/alex#261 for us here as well?

In this case, the highlight colour for the uni|fied logo is #0366d6 (I use a darker blue in dark mode, to have a better contrast on a dark background, but I’m guessing the favicon will be light? All colours are from Primer)
For favicons, maybe one u is all that can fit though.

Less important, but if you’re feeling creative, we could do with a logo to represent unified as a whole. The word marks are fine for individual projects (re|mark, v|file, etc), but unified as a collective could be represented with a new logo. A while back we came up with a couple of WIP concepts:

A friend of @johno made ☝️

I thought it’d be fun to maybe do something that moves ☝️

[danoszz]

@wooorm Sure thing! I'll work on some variations and post progress in this PR.

[ChristianMurphy]

@wooorm @danoszz would it make sense to close this PR, and open a tracking ticket to discuss iconography further?

[danoszz]

@ChristianMurphy makes sense to me, I'll open a new ticket regarding the above.