chore(rebranding): removing platform references

[jherey]

Summary

This PR follows the rebranding effort from the Docs team and applying them in the Node.js SDK.
Details here.
Docs PR

Description

• Removed references to "platform"
• Removed references to just "commercetools"

Todo

• Tests
  • Unit
  • Integration
  • Acceptance
• Documentation
• Type label for the PR

[changeset-bot]

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