feat(react-magma-docs): Implement scrollspy.

[nikitaorliak-cengage]

Issue: #1023

What I did

Implement scrollspy in docs.

Screenshots:

Checklist

• [x] changeset has been added
• [x] Pull request description is descriptive
• [x] I have made corresponding changes to the documentation
• [x] New and existing unit tests pass locally with my changes
• [ ] I have added tests that prove my fix is effective or that my feature works

How to test

Open docs -> Open any component -> Scroll to a new tab -> Check if the On this page navigation behaves as intended.

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 4169491d096c53d3503c28daf65dec310d28d65f

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

| Name | Type | | ---------------- | ----- | | react-magma-docs | Patch |

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[github-actions[bot]]

🚀 Deployed on https://docs-preview-1491--upbeat-sinoussi-f675aa.netlify.app

[github-actions[bot]]

🚀 Deployed on https://storybook-preview-1491--upbeat-sinoussi-f675aa.netlify.app