Closely match soft-era VS Code 1.0 colors

[codehearts]

I updated all of the available colors to more closely resemble the VS Code theme. It's not a 100% match, but there's no more harsh greens or reds anymore 🎉

I also came across mjswensen/themer, which can generate themes for different apps and editors, it might be useful for keeping everything in sync. I also looked at automating the screenshot process, but didn't really find anything. termtosvg almost handles terminal Vim's colors perfectly, and there are some projects that could maybe headlessly render Linux GUIs to svg files, but nothing nice and simple afaik

Anyways, the fun part! 🖼

Airline theme (insert mode could use some work, the green colors are a bit close to one another)

[codehearts]

This fixes #9 and also resolves #3 in the process ✨