docs migration - Deploying to DigitalOcean

Source: documentation/server/guides/deploying/digital-ocean.md
Proposed disposition: Migrate
Proposed destination: server-guides/Sources/ServerGuides.docc/deploying/digital-ocean.md
Reviewer: @swiftlang/server-workgroup

Checklist

• Create a GitHub issue to track this migration
• Determine disposition (suggested: Migrate) and confirm destination
• Review source for accuracy against current DigitalOcean Droplet configuration options
• Translate Jekyll markdown to DocC markdown format
  • Remove YAML front matter
  • Convert any Jekyll callouts to DocC-style callouts
  • Verify all DigitalOcean console steps are current
• Add article to ServerGuides.docc/Documentation.md under a "Deployment" topic group
• Run swift package generate-documentation --analyze --warnings-as-errors in server-guides/
• Preview locally with swift package --disable-sandbox preview-documentation in server-guides/
• Submit PR to this repository for server workgroup review
• After merge and publication: add redirect_to: in the swift.org source file's front matter
• Submit redirect PR to swift-org-website

Start with documentation/server/guides/deploying/digital-ocean.md and compare it with the target server-guides/Sources/ServerGuides.docc/deploying/digital-ocean.md location. Review the DigitalOcean steps, convert the documented Jekyll content, and add the article to ServerGuides.docc/Documentation.md under a Deployment topic group. Run the two listed documentation commands in server-guides/; completion also requires the post-publication source redirect and redirect PR.