add intitial healthcheck docs

[dcmcand]

Reference Issues or PRs

What does this implement/fix?

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• 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)
• 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

• 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.

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[viniciusdc]

Hi @dcmcand thanks for the PR, can you address the failing test and also for the page to show up in the final doc you also need to include it in the https://github.com/nebari-dev/nebari-docs/blob/main/docs/sidebars.js#L55

[viniciusdc]

@dcmcand can you move this example to a code block?

[kcpevey]

@dcmcand I added a table of available healthchecks to explain what each one does. Can you review and make sure this is correct?

Also, apologies for the unreadable format - yarn formatting added tons of spaces which makes it hard to read in md format.