Add Backstage logo

[marcopollivier]

Issue: closes #7948

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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

This PR adds the Backstage logo

I based this PR with the original documentation https://backstage.io/docs/overview/logos

[marcopollivier]

@LitoMore this thread helped me a lot. #7908 (comment)

Is it makes sense to be part of the documentation?

[LitoMore]

@marcopollivier The problems you'll run into when processing with icons can vary, and the ones I've mentioned in the comments are just the smoothest. In practice, there may be more problems, and if you want to write a document, it will be complicated and difficult to read.

We already have several related discussions, and I prefer to share the basic principles of SVG and how to use the editor, rather than writing a step-by-step tutorial:

• New with SVGs? #5076
• Unable to combine paths in the svg #7603
• Solving common linter problems #4935
• How to test icons local ? #6689

[marcopollivier]

Hmmm. Makes sense. 🤔

[LitoMore]

@marcopollivier There are some differences.

According to their guidelines, we'd better use the teal one as a reference.

These links can be found at https://backstage.io/docs/overview/logos.

[marcopollivier]

@LitoMore I changed, but I'd like to validate as you did 🤔

[dirien]

Hi @marcopollivier ,

Thanks for your contribution to simple-icons!

It's a perfect fit:

[LitoMore]

@marcopollivier For reviewing the difference, see #7752 (comment).