update README image scanning docs

PR Type:

Documentation

PR Description:

This PR updates the README documentation to correct the image scanning example. The previous version incorrectly stated to replace image: "nginx" with the appropriate image name. This has been corrected to image: "quay.io/kubescape/kubescape".

PR Main Files Walkthrough:

files:

`README.md`: The documentation for scanning images with Kubescape Github Action has been updated. The image name in the example has been corrected from `nginx` to `quay.io/kubescape/kubescape`.

User Description:

The example uses quay.io/kubescape/kubescape as the image and not nginx. This PR updates the line mentioning to replace image: "nginx" since it is misleading.

PR Analysis

🎯 Main theme: Updating README documentation
📝 PR summary: This PR corrects the image scanning example in the README documentation. The image name in the example has been changed from nginx to quay.io/kubescape/kubescape.
📌 Type of PR: Documentation
🧪 Relevant tests added: No
⏱️ Estimated effort to review [1-5]: 1, because it's a simple documentation update with no code changes.
🔒 Security concerns: No

PR Feedback
💡 General suggestions: The PR is straightforward and the changes made are clear. The update in the documentation is necessary to avoid any confusion for the users.
🤖 Code feedback:

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kubescape / github-action