refactor: move sgid and email login components to their own dirs

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Name	Status	Preview	Comments	Updated (UTC)
starter-kit	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jan 3, 2024 0:10am

[karrui]

Current dependencies on/for this PR:

• main
  • PR #236
  • PR #244 👈
    • PR #245

This stack of pull requests is managed by Graphite.