Update docs to the latest UI

[kcpevey]

The UI has had a lot of improvements recently. Now that the interface has stabilized a bit, its time to update docs. This PR updates all the relevant images and also modifies wording in a few places.

Reference Issues or PRs

Resolves #411

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)
• 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.

Any other comments?

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Name	Status	Preview	Comments	Updated (UTC)
jhub-apps	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Sep 19, 2024 6:36pm
jhub-apps-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Sep 19, 2024 6:36pm

[kcpevey]

This is ready for review whenever someone has time :)

[aktech]

Looks good, apart from some minor suggestions.

[kcpevey]

@aktech I've made all the suggested modifications. This is ready for another look.

[aktech]

Looks awesome, thanks @kcpevey 🎉