Add Neovim (#2221)

[runxel]

Issue: Closes #2221

Checklist

• I updated the JSON data in _data/simple-icons.json
• I optimized the icon with SVGO or SVGOMG
• The SVG viewbox is 0 0 24 24

Description

Logo can be found at their Github repo. Color #57A143 was taken from the flat color version (also in the repo).

[PeterShaggyNoble]

Which version of the logo did you use, @runxel? This is what I get from https://github.com/neovim/neovim.github.io/blob/master/logos/neovim-logo-1color.svg, with your version overlaid in red for comparison.

[runxel]

I've corrected an error they made (or maybe it's because svg does not support stroke styles, not sure).
The technical explanation:
When making a closed outline you can choose on which side the resulting line should reside: outside, inside, or middle.
In their svg they didn't converted the outline into a shape, and missed to correct the error that the line is not any longer inside now. This distorts the logo. Just have a look at the flat one e.g. and compare it:
https://github.com/neovim/neovim.github.io/blob/master/logos/neovim-logo-flat.png

(I think my version should be right...)

[PeterShaggyNoble]

Yep, looks like you're right, @runxel; if, instead of converting that stroke to a path, I remove the stroke and add a fill then things line up perfectly.

Given that, I think this one's good to go so I'll merge it in now. Thanks for your work on it.