Chore: Update CTA link for Editor selections to add tier param

[saurabhg772244]

📑 Summary

• Updated the CTA link for Mermaid Plus to add tier param in checkout url

Resolves #

📏 Design Decisions

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📋 Tasks

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• 📖 have read the contribution guidelines
• 💻 have added necessary unit/e2e tests.
• 📓 have added documentation. Make sure MERMAID_RELEASE_VERSION is used for all new features.
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