updating docs to reflect the ability to scale to zero in AWS

[jscearce3]

Reference Issues or PRs

Addresses issue #410.
Adjusts language to reflect the ability to scale to zero with the AWS provider.

What does this implement/fix?

Put a x in the boxes that apply

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds a feature)
• Breaking change (fix or feature that would cause existing features not to work as expected)
• [x ] Documentation Update
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no API changes)
• Build related changes
• Other (please describe):

Testing

• Did you test the pull request locally?
• Did you add new tests?

Documentation

Access-centered content checklist

Text styling

• [x ] The content is written with plain language (where relevant).
• [x ] If there are headers, they use the proper header tags (with only one level-one header: H1 or # in markdown).
• [ x] All links describe where they link to (for example, check the Nebari website).
• [ x] This content adheres to the Nebari style guides.

Non-text content

• All content is represented as text (for example, images need alt text, and videos need captions or descriptive transcripts).
• If there are emojis, there are not more than three in a row.
• Don't use flashing GIFs or videos.
• If the content were to be read as plain text, it still makes sense, and no information is missing.

Any other comments?

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[viniciusdc]

LGTM