docs: consolidate create account onboarding

[sktbrd]

Summary

• Prioritize email signup as the recommended Skatehive onboarding path
• Explain how email users can request Hive account sponsorship
• Explain how existing Hive users can sponsor newcomers
• Consolidate the duplicate top-level create-account page into the Get Started guide
• Keep localized docs aligned for pt-br, es, fr, and lg

Checks

• pnpm build ✅
• pnpm lint ⚠️ not available in this docs package (no lint script)

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 7d42b49e-6929-4c98-add4-40bf7b2a4218

📥 Commits

Reviewing files that changed from the base of the PR and between f55edb7 and 55e082d.

📒 Files selected for processing (11)

• docs/Get Started/create-account.md
• docs/create-account.mdx
• i18n/es/docusaurus-plugin-content-docs/current/Get Started/create-account.md
• i18n/es/docusaurus-plugin-content-docs/current/create-account.mdx
• i18n/fr/docusaurus-plugin-content-docs/current/Get Started/create-account.md
• i18n/fr/docusaurus-plugin-content-docs/current/create-account.mdx
• i18n/lg/docusaurus-plugin-content-docs/current/Get Started/create-account.md
• i18n/lg/docusaurus-plugin-content-docs/current/create-account.mdx
• i18n/pt-br/docusaurus-plugin-content-docs/current/Get Started/create-account.md
• i18n/pt-br/docusaurus-plugin-content-docs/current/create-account.mdx
• sidebars.js

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/consolidate-create-account

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