[WIP] Update nextra from v2 to v3. Make minimal, necessary changes only. Don't break anything during the upgrade. Make sure the website builds by following the instructions in the README.

[Copilot]

Nextra v2 to v3 Upgrade Plan

Updating the WATcloud website from Nextra v2.13.2 to v3.x (latest stable). This upgrade should bring performance improvements and new features while maintaining backward compatibility.

Checklist:

• Assess current state (Nextra v2.13.2, nextra-theme-docs v2.13.2)
• Set up basic development environment and fixtures for testing
• Update package.json dependencies to Nextra v3
• Test build and identify breaking changes
• Update next.config.js configuration if needed
• Update theme.config.tsx if needed
• Fix any import path changes
• Fix any component API changes
• Verify all existing functionality works
• Run full build and test
• Update any documentation if needed

Current State:

• Nextra v2.13.2 with docs theme
• Using Next.js 13.5.6
• MDX pages with components like Cards, Callout, Link
• Custom theme configuration
• Sentry integration and bundle analyzer

Breaking Changes to Watch For:

• Component import paths
• Theme configuration structure
• Plugin configuration format
• Component props and APIs

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