Add GNU Bash

[runxel]

Issue:
Closes #2183

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

The logo is from their github repo.
The color #4EAA25 is from the style guide. But I would also be okay with #293137.

[foo-dogsquared]

Just for clarification, what file from the repo did you use to make the PR (e.g., the EPS, SVG)?

Apparently, some of the SVGs from the official repo are a bit malformed.

Here's the 48x48.svg from the repo. (Take note of the bottom edge.)

Here's the 512x512.svg from the repo.

Here's the 24x24.svg file overlaid with your PR. (No need to compare.)

[runxel]

I took 24x24_white, which doesn't look too bad, right? 😅

[PeterShaggyNoble]

There's a monochrome SVG here, if it's any help. But if there are discrepancies/doubts, I'd say go back to the source files.

[foo-dogsquared]

24x24_white.svg also has the same (if not similar) malformation with its colored counterpart.

But compared to the 512x512 versions of the SVG, it's not too bad.
The only (very) minor problem is the pictured part.

[runxel]

Thanks to the comment of @PeterShaggyNoble now the updated version!
It's taken from the ground truth, their Illustrator file, which also is in the the github repo.

Thanks again for everyone who commented and made this PR better! 🌮

[phatbhoy67]

Thanks for your work on this one @runxel 👍