docs: fix broken Node.js, NGINX, and systemd links

[Njoxpy]

Comprehensive Documentation Audit & Broken Link Fixes Overview

• This update addresses multiple broken, outdated, and non-functional external documentation links within the production best practices guide (best-practice-performance.md). Over time, changes to the routing structures of official platforms like Node.js, NGINX, and freedesktop.org caused several high-traffic reference links to return 404 Not Found or Directory Not Found errors. This pull request resolves those navigation dead-ends to ensure developers have immediate, reliable access to the correct external resources.

Detailed Technical Breakdown

• NGINX Reference Corrections
• Issue: The links referencing ngx_http_gzip_module and load_balancing were missing explicit file extensions, causing the remote NGINX server to throw 404 Not Found errors instead of resolving the paths.
  • Resolution: Modified the target endpoints to include the required .html extensions (e.g., changing from /load_balancing to /load_balancing.html), successfully restoring access to the official web server documentation.
• Node.js API Route Updates
• Issue: Links pointing to core Node.js modules—specifically cli, console, process, domain, and cluster—relanded users on generic server errors reading Directory not found due to legacy trailing slashes or missing file components.
  • Resolution: Standardized the URL formats to point directly to the specific asset structures utilized by the modern Node.js documentation server (e.g., swapping out /api/cluster for the absolute web path /api/cluster.html).
• Systemd Reference Modernization
• Issue: The reference hyperlink tracking systemd.unit pointed to an outdated, insecure HTTP URL that failed to route users to the actual unit file definitions.
  • Resolution: Upgraded the URI scheme to modern HTTPS standards and remapped the target path to point to the active, live-updating repository path /man/latest/index.html on the freedesktop.org domain.
• Multi-Language Localization Sync
• Scope of Impact: Rather than fixing these references solely within the English documentation framework, the identical URL corrections were audited, updated, and verified across all ten localized translation files in the repository workspace.
  • Affected Locales: English (en), German (de), Spanish (es), French (fr), Italian (it), Japanese (ja), Korean (ko), Brazilian Portuguese (pt-br), Simplified Chinese (zh-cn), and Traditional Chinese (zh-tw).

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Lighthouse	1 paths audited Performance: 99 (🟢 up 2 from production) Accessibility: 100 (no change from production) Best Practices: 100 (no change from production) SEO: 100 (no change from production) PWA: 80 (no change from production) View the detailed breakdown and full score reports
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[krzysdz]

Translations (including links in translated docs) are managed through Crowdin.

Duplicate of #2324