Add CI Quality Gate workflow (Hugo build + Lychee link checker)

[yoursanonymous]

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• The commit message follows our guidelines

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)

/kind feature

• What this PR does / why we need it:
  This PR adds a modern CI/CD pipeline to ensure documentation quality.

• Automated Hugo Build: Verifies that the site compiles correctly with the production specified Hugo version (0.57.2)
• Link Integrity: Implements lychee-action to scan all Markdown files and generated site pages for broken URLs
• Pre-emptive Error Catching: Ensures that broken templates or missing assets are caught before merging to master.

• Which issue(s) this PR fixes:
  Fixes Implement automated CI quality gates for build validation and link integrity #482

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