docs(editor): sidebar navigation reorganization

[lancesnider]

Note: This PR is about structure, not content. If I did change content, it was as little as possible to support the new structure.

Before/After:

The goal of this PR is to:

• Make the editor docs less intimidating for users
• Separate core features from side quests
• Make the core features scannable
• Give it room to grow along with our upcoming features

Stuff I'm not 100% sure about

• In an effort to rename things based on what you're trying to achieve, I renamed the Layouts parent category to Responsive Design. Pushback welcome.
• There's a category that includes groups, solos, draw order, freeze origin, and transform spaces. I called it Hierarchical Relationships, which I don't love, but can't think of anything better.
• Renamed Exporting to Publishing because it also includes share links.
• In its current state, Assets probably feels like it should go under Design. Once we cover components and scripts as assets, I think it makes more sense as a top-level category.

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