Docusaurus upgrade and fixing broken CI pipeline

[nslee333]

Summary

This PR updates the CI/CD pipeline and modernizes the Docusaurus documentation setup to maintain consistency with the dnp3 project.

CI/CD Updates

• GitHub Actions: Updated all actions from v3 to v4 (checkout, upload-artifact, download-artifact)
• Rust toolchain: Removed beta from the CI matrix
• Artifact handling:
  • Fixed artifact naming to prevent conflicts by adding target-specific names (ffi-modules-{target})
  • Consolidated Java artifacts (JAR and POM) into a single java-bindings artifact
  • Added merge-multiple: true for artifact pattern matching
• Build commands: Switched from yarn to npm in the guide build job

Documentation/Docusaurus Updates

• Migrated to Docusaurus 3: Updated from Docusaurus 2 to 3
• Mermaid support:
  • Removed custom mermaid plugin implementation
  • Switched to Docusaurus's built-in @docusaurus/theme-mermaid
  • Removed direct mermaid dependency from package.json
  • Deleted unused guide/plugins/mermaid/ directory
  • Deleted custom guide/src/theme/Mermaid.js component
• Package manager: Standardized on npm (removed yarn.lock, kept package-lock.json)
• Dependencies: Updated prism-react-renderer import syntax for compatibility
• Documentation: Updated README.md with npm commands and Node.js setup instructions

Build Dependencies

Updated allowed.json with new build-only dependencies:

• adler2
• cfg_aliases
• once_cell_polyfill
• shlex
• Added license entries for core-foundation and windows-link

Other Changes

• Removed unused guide/static/index.html file
• All changes tested and confirmed working with local build

This brings the rodbus CI/CD and documentation setup in line with the dnp3 project standards.

[gemini-code-assist]

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