quick pr to allow for easier manual rtl testing

[wibjorn]

Link: preview

Recently, we encountered a situation where we needed to better test on RTL. Adding some basic support for doing so without editing elements or opening the developer console.

Testing

1. Open any standard documentation page.
2. See direction button to the right of the theme button.
3. Click it. Click it again.

Contributor checklist

• Did you update the description of this pull request with a review link and test steps?
• Did you submit a changeset? Changesets are required for all code changes.
• Does your pull request add a new page to the documentation site? Add your new page for automated accessibility testing in /integration/tests/accessibility.

[changeset-bot]

🦋 Changeset detected

Latest commit: 46b3d2b

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

This PR includes changesets to release 1 package

Name	Type
@microsoft/atlas-site	Minor

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