Kalkeshwar

new icon: stackblitz (original, original-wordmark, plain-wordmark, line, line-wordmark)

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## Double check these details before you open a PR - [x] PR does not match another non-stale PR currently opened - [x] PR name matches the format *new icon:...

feat(pixels): add my new pixel

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## Checklist - [x] I ran `npm test` locally and it passed without errors. - [x] I only edited the `_data/pixels.json` file. - [x] I entered the `username` in the...

[ICON REQUEST]: StackBlitz

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### I have searched through the issues and didn't find my problem. - [X] Confirm ### About the icon StackBlitz is an instant fullstack web IDE for the JavaScript ecosystem....