Added Deployment guide for DigitalOcean

[Hanson2258]

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Added a deployment guide for DigitalOcean.

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For Astro version: 5.14.0.

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• Hanson C. (Discord: Hanson2258)

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en/guides/deploy/digitalocean.mdx	Localization added, will be marked as complete.

Warnings reference

Icon	Description
🔄️	The source for this localization has been updated since the creation of this pull request, make sure all changes in the source have been applied.

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