chore(docs): fix icon, merge provider and focus scope pages

[gabrielmfern]

Summary by cubic

Merged the EditorFocusScopeProvider docs into the EditorFocusScope page and fixed the icon metadata, simplifying navigation and keeping links accurate.

• Refactors
  • Removed editor-focus-scope-provider.mdx; moved content into editor-focus-scope.mdx under the “EditorFocusScopeProvider” section (#editor-focus-scope-provider).
  • Updated import examples to include both components from @react-email/editor/ui; consolidated examples and props.
  • Fixed icon from "crosshair" to "crosshairs".
  • Cleaned up sidebar and links: removed the provider page from docs.json; updated Inspector docs to link to the new anchor.

^{Written for commit f80c319. Summary will update on new commits.}

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Latest commit: f80c319

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Project	Deployment	Actions	Updated (UTC)
react-email	Ready	Preview, Comment	Apr 17, 2026 0:30am
react-email-demo	Ready	Preview, Comment	Apr 17, 2026 0:30am

[cubic-dev-ai]

No issues found across 5 files

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.