Add ScrollToBottom behaviour to one of the buttons in dentistry header

[RitwikSrivastava]

Please always provide the GitHub issue(s) your PR is for, as well as test URLs where your change can be observed (before and after):

Fixes #198

Test URLs:

• Original: https://www.sunstar-foundation.org/dentistry/adult

• Before: https://main--sunstar-foundation--hlxsites.hlx.live/dentistry/adult

• After: https://scrolToBottom--sunstar-foundation--hlxsites.hlx.live/dentistry/adult

• [ ] New Blocks introduced in this PR If yes, please provide details below

Block Name	Documentation
For e.g. cards	doc-link

• [ ] New variations introduced in this PR

Variation Name	Documentation
For e.g. cards (grid)	doc-link

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Commits

* [5e39464](https://github.com/hlxsites/sunstar-foundation/pull/204/commits/5e39464eb271f3f1a5ec989bd62c96051aee45f2) :white_check_mark: (latest)

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Page	Scores	Audits	Google
/dentistry/adult