Refactor: Convert legacy application to docs-only mode

[ben-fornefeld]

This PR transforms our legacy Next.js application to serve only documentation content by:

• Removing dashboard components and pages
• Stripping authentication requirements
• Maintaining documentation routes and content
• Preparing for proxy integration with new dashboard

Technical changes

• Removed auth-required wrappers from documentation pages
• Eliminated dashboard-specific components and routes
• Removed unused dependencies related to dashboard functionality
• Updated application configs & sitemap.xml to support being proxied by new dashboard app

Testing

• Verified all documentation pages render correctly without auth
• Confirmed navigation works as expected
• Tested proxy integration with new dashboard application

Next steps

1. Once merged, the new dashboard will proxy to this application for documentation content
2. In the future, we'll migrate documentation to the new system completely

[linear]

E2B-1522 remove dashboard & auth parts to only host /docs

[changeset-bot]

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Latest commit: 9798272

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