Fix spelling of "hygiene" in Security Hygiene Guide URL and labels

[Copilot]

Description

This PR corrects the spelling of "hygiene" (previously misspelled as "hygine") in the Security Hygiene Guide for Project Maintainers page URL and sidebar label.

Changes

• Renamed file: docs/projects/best-practices/security/security-hygine.md → security-hygiene.md
• Updated sidebar label: Changed from "Security Hygine" to "Security Hygiene" in the page frontmatter
• Updated redirects: Modified static/_redirects to:
  • Update existing redirect rules from /maintainers/security/security-guidelines* to point to the corrected URL
  • Add new redirect rules from the old misspelled URL /projects/best-practices/security/security-hygine* to the corrected URL /projects/best-practices/security/security-hygiene/

Impact

Users visiting the old misspelled URL at https://contribute.cncf.io/projects/best-practices/security/security-hygine/ will be automatically redirected (301 permanent redirect) to the correct URL at https://contribute.cncf.io/projects/best-practices/security/security-hygiene/.

All existing links and bookmarks remain functional through the redirect rules, ensuring backward compatibility.

Fixes the issue reported in the original ticket where the Security Hygiene Guide had an incorrect URL slug.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Correct the spelling of "Hygiene"</issue_title>
<issue_description>Correct spelling of "hygine" in the slug for the "Security Hygiene Guide for Project Maintainers" page.

https://contribute.cncf.io/projects/best-practices/security/security-hygine/</issue_description>

<agent_instructions>Provide an update to the _redirect file so that anyone visiting the old URL will be redirected to the new corrected one.</agent_instructions>

Comments on the Issue (you are @copilot in this section)

Fixes #89

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[Copilot]

Pull Request Overview

This PR corrects a spelling error in the URL slug and references for the Security Hygiene Guide, changing "hygine" to the correct spelling "hygiene". The changes ensure proper SEO, user experience, and maintain backward compatibility through appropriate redirects.

Key Changes:

• Renamed the markdown file from security-hygine.md to security-hygiene.md
• Updated the sidebar_label metadata to use correct spelling
• Added redirects to preserve old URLs and updated existing redirects to point to the corrected URL

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
static/_redirects	Updated existing redirects and added new redirects from the misspelled URL to the corrected URL
docs/projects/best-practices/security/security-hygiene.md	Corrected the sidebar_label from "Security Hygine" to "Security Hygiene"

[nate-double-u]

Looks good, thanks @copilot.