Add Headless Support to UI

[jbouder]

This update is intended to support the scenario where the app form may be embedded in another app and does not need to display any top nav or side bar. This implementation will toggle and apply styling based on the following querystring parameter: headless=true

Reference Issues or PRs

Supports #472

What does this implement/fix?

Put a x in the boxes that apply

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

Testing

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

Documentation

Access-centered content checklist

Text styling

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

Screenshots

Any other comments?

• Provides headless functionality through the use of a headless=true query param
• Tracks headless state using global state
• Hides top nav and side bar based on param
• Hides Back buttons based on param

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