Add ZeroKit Website Grader to Security > Test

[Stembel]

Adds ZeroKit Website Grader to the Security > Test section.

What it does

Grades any website on performance, security headers, SSL/HTTPS, and SEO basics — returns a letter grade (A+ through F) with actionable recommendations.

Checklist

• Browser-based — no downloads or native app installs
• Direct link — goes straight to the tool (not a multi-tool landing page)
• 100% free — no signups, trials, paywalls, or usage limits
• Alphabetically sorted within the section
• Matches existing entry format

[github-actions]

Hey Stembel! Thanks for your submission! 🚀

To keep awesome-devtools instantly accessible for everyone, all tools must be:

• Browser-based — no downloads or native app installs
• Direct link — goes straight to the tool (not a multi-tool landing page)
• 100% free — no signups, trials, paywalls, or usage limits

Please make sure your PR meets these criteria. It may take some time for your submission to be reviewed — you can occasionally comment with a "bump" to bring more attention to it.

Thanks for contributing! 🙌