Feat: Add Dutch Translation (I18N) Support

[homelab-alpha]

PR: Add Dutch Language Support and I18N Features

✨ Feature: Dutch Translation & Internationalization (I18N)

This update introduces Dutch language support, enhancing the multilingual capabilities of the platform. It also lays the groundwork for future translations, with a focus on nl/docs.

🔧 Configuration Updates

• Added Dutch language support to hugo.toml
• Introduced Dutch translation file (nl.toml)

✅ Summary of Changes

• Enabled Dutch language in hugo.toml
• Added Dutch translation file (nl.toml)
• Translated the following content in nl/docs:
  • quickstart.md
  • code.md
  • mermaid.md
  • All index.md files
  • example-doc.md

🔍 Checklist

• [x] Code tested and confirmed to work as expected
• [x] Documentation updates included in this PR
• [x] Verified that all internationalization (I18n) changes are accurate
• [x] No new errors or warnings introduced

🎨 Dark Mode

• [x] The UI has been tested both in dark and light mode
• [x] This PR does not change the UI (by default NO)

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[homelab-alpha]

@colinwilson, if you have some time, I would appreciate some feedback on this PR. I also have a question: is it possible to add the landing.yaml in multiple languages to the current project, or does it still need to be added to Lotus Docs?

• Related to #213 ?