docs: Security practices

[deerskindoll]

What does this pull request change?

a doc about best security practices

What issues does this pull request fix or reference?

https://github.com/eclipse-che/che/issues/22835

Specify the version of the product this pull request applies to

main, 7.93.x

Pull Request checklist

The author and the reviewers validate the content of this pull request with the following checklist, in addition to the automated tests.

• Any procedure:
  • [ ] Successfully tested.
• Any page or link rename:
  • [ ] The page contains a redirection for the previous URL.
  • Propagate the URL change in:
    • [ ] Dashboard default branding data
• [ ] Builds on Eclipse Che hosted by Red Hat.
• [ ] the Validate language on files added or modified step reports no vale warnings.

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