Update website docs to reflect the serve flag rename from --port/--listen to --http-port/--http-listen. Closes #27

[binaek]

Summary

• Replaces legacy serve flag names in CLI docs and examples with the new HTTP-scoped flag names.
• Keeps defaults and behavior descriptions unchanged while aligning all user-facing documentation to the breaking CLI update.

Changes

• Updated src/content/docs/cli-reference/index.md:
  • option tables and example commands now use --http-port and --http-listen.
• Updated src/content/docs/cli-reference/serve.md:
  • flag sections, examples, and command snippets now use renamed flags.
• Updated src/content/docs/getting-started.md:
  • troubleshooting guidance now references --http-port.
• Updated src/content/docs/running-sentrie/serving-policies.md:
  • serve flag descriptions and usage examples now reference --http-port and --http-listen.

Testing

• Performed repo-wide checks to ensure no --port/--listen references remain in website docs.

[github-actions]

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