feat(3col): add support for new layout #149

[marnel-mangrubang]

Alaska Airlines Pull Request

This PR adds support for the new 3 column page layout classes.

• Added new layout class pageLayout-3col inside the _grid.scss file.

Fixes: #149

Summary:

Please summarize the scope of the changes you have submitted, what the intent of the work is and anything that describes the before/after state of the project.

Type of change:

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• [X] New capability
• [ ] Revision of an existing capability
• [ ] Infrastructure change (automation, etc.)
• [ ] Other (please elaborate)

Checklist:

• [X] My update follows the CONTRIBUTING guidelines of this project
• [X] I have performed a self-review of my own update

By submitting this Pull Request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

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[blackfalcon]

:tada: This PR is included in version 4.8.0 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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