Consolidate visual editor

[ethanpalm]

Documentation changes

This PR converts the visual editor back to a single page. This flattens the navigation of the Get started section of the docs and makes the editor a single page for people to learn and use the feature.

This PR also adds a few new sections and screenshots to the editor guide that were missing

• rename pages
• change file type
• delete pages

Closes https://linear.app/mintlify/issue/DOC-163/consolidate-visual-editor-page

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For Reviewers

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✅ Technical accuracy

• Code examples work as written
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✅ User experience

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