docs: gitbook migration

[Rajakavitha1]

Why

Issues

Motivation

What

Summary of changes

Checklist

• Added/updated unit tests
• Added/updated documentation
• Checked for typos in variable names, comments, etc.
• Added licences for new files

Testing

[CLAassistant]

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1 out of 2 committers have signed the CLA.

✅ Rajakavitha1
❌ Rakavitha Kodhandapani

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