feat(docs): add command to open the documentation in the default browser

[almeidazs]

Summary

Add a resend docs command that opens the Resend documentation in the user's default browser.

What changed

• register a new docs command in the main CLI
• add a docs command handler that opens https://resend.com/docs
• extend the shared browser URL map with a documentation URL
• add a test covering the new command behavior

Why

This makes it easier to jump to the documentation directly from the CLI, using the same browser-opening flow
already used by other commands.

Testing

• added tests/commands/docs.test.ts
• verified the command calls openInBrowserOrLog with RESEND_URLS.documentation

---

Summary by cubic

Adds a new resend docs command that opens the Resend documentation in the default browser. Makes it faster to jump from the CLI to docs.

• New Features
  • Adds docs command with help text and example.
  • Opens RESEND_URLS.documentation using the shared browser helper.
  • Extends the URL map with documentation and adds a test for the command.

^{Written for commit df55abe. Summary will update on new commits.}

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[almeidazs]

Can you review this? @felipefreitag