Overview/ait 189 intro token

[rainbowFi]

Description

Adds overview pages to the documentation covering

• the overall AIT product, listing the major features and linking them to other documentation
• token streaming, including an overview of the proposed architecture and patterns

Checklist

• Commits have been rebased.
• Linting has been run against the changed file(s).
• The PR adheres to the writing style guide and contribution guide.

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch overview/ait-189-intro-token

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[GregHolmes]

Due to some confusion in commits (not sure what went wrong) I've created a new branch, cherry picked @rainbowFi 's commits and raised a new PR: #3035