Docs: Updated auth providers documentation

[madster456]

Docs updated to contain all doc pages for auth providers.

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[!IMPORTANT] Updates documentation to include setup guides for various authentication providers and updates navigation to reflect these additions.

• Documentation Updates:
  • Adds detailed setup guides for authentication providers: Apple, Bitbucket, Discord, Facebook, GitHub, GitLab, Google, LinkedIn, Microsoft, Spotify, X (Twitter), Passkey, and Two-Factor Auth (2FA).
  • Updates docs-template.yml to include a new "Auth Providers" section in the navigation.
• New Files:
  • Adds overview.mdx for an overview of all auth providers.
  • Adds individual .mdx files for each provider in getting-started/auth-providers/ directory.

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