What does this PR do?

Replaces the cropped ASCII flow diagram on the rate limiting "How it works" page with the existing Mintlify Steps component. The content is the same regional convergence flow, but it no longer depends on a fixed-width code block.

The Linear issue is linked by the branch name.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• Chore (refactoring code, technical debt, workflow improvements)
• Enhancement (small improvements)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How should this be tested?

• git diff --check
• npx --yes mintlify@4.2.573 validate from docs/product

mise wasn't available in this checkout, so Mintlify validation was run directly with npx. The command emitted dependency deprecation warnings before validation passed.

Checklist

Required

• Filled out the "How to test" section in this PR
• Read Internal Workflow Guide
• Self-reviewed my own code
• Commented on my code in hard-to-understand areas
• Ran pnpm build
• Ran pnpm fmt
• Ran mise run fmt
• Checked for warnings, there are none
• Removed all console.logs
• Merged the latest changes from main onto my branch with git pull origin main
• My changes don't cause any responsiveness issues

Appreciated

• If a UI change was made: Added a screen recording or screenshots to this PR
• Updated the Unkey Docs if changes were necessary