Add terminus 3.6.0 release

[namespacebrian]

Summary

Release notes - added terminus 3.6.0 release

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[IngridKwok]

@namespacebrian @rachelwhitton
I've made some revisions to the release note, including adding more clarity around the new self-serve command for renaming site labels in Terminus 3.6.0. Please take a look and let me know if you have any additional feedback.

[pantheon-decoupled]

⚡ Deployed with Pantheon Decoupled

This build was successfully deployed with Pantheon. You can track the build logs here.

👀 Preview: https://pr-9232-documentation.appa.pantheon.site
🛠️ Manage in Pantheon: https://dashboard.pantheon.io/site/2b30153f-e8b1-4427-b076-6109e704ba5d/overview