Added Dutch translation

[Fabian-Evolved]

Translation Pull Request of the full Documentation / Azuriom.com website in the Dutch Language.

Currently Completed:

• Azuriom.com website translation.
• themes.md translation.
• server-link.md translation.
• plugins.md translation.
• mails.md translation.
• installation.md translation.
• _index.md translation
• api-auth.md translation
• faq.md translation

This pull request is finally ready for review.

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[MrMicky-FR]

Amazing job, thanks 🎉