docs: migration of the third set of content

[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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[paulb-seldon]

Thank you for this! Pages added look good, and we can fix other issues before going live (example notebooks and links to old docs) on top of this.