docs: add example for security agent readiness

[arnab-logs]

This PR adds a new documentation example demonstrating how to use the Node Readiness Controller to gate node scheduling on the readiness of a security agent (for example, Falco).

The following files were changed:

• Added a new example at:
  • docs/book/src/examples/security-agent-readiness.md
• Updated the documentation summary to include the new page:
  • docs/book/src/SUMMARY.md

Fixes #100

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[arnab-logs]

I looked into a couple of approaches for handling the falco.sh file and made updates based on that. Happy to rework anything after review if there’s a preferred direction.