feat(docs): add version selector dropdown

[zyzzmohit]

Fixes #147

Added docsVersionDropdown navbar item to enable users to select and view documentation for their specific Kmesh version.

Changes:

• Added version dropdown between Documentation and Blog navbar items
• Uses Docusaurus native versioning feature

[kmesh-bot]

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[kmesh-bot]

Welcome @zyzzmohit! It looks like this is your first PR to kmesh-net/website 🎉

[gemini-code-assist]

Summary of Changes

Hello @zyzzmohit, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a significant enhancement to the documentation site by integrating a version selector dropdown into the navigation bar. This feature empowers users to effortlessly switch between different versions of the Kmesh documentation, ensuring they can always access the content relevant to their specific Kmesh installation. The change improves the overall usability and accessibility of the documentation.

Highlights

• Docs Version Selector: A docsVersionDropdown navbar item has been added to enable users to select and view documentation for their specific Kmesh version.
• Docusaurus Native Versioning: The implementation leverages Docusaurus's native versioning feature for managing and displaying different documentation versions.
• Navbar Placement: The new version dropdown is positioned in the navbar between the existing 'Documentation' and 'Blog' links.

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[gemini-code-assist]

Code Review

This pull request correctly adds a version selector dropdown to the documentation navbar using Docusaurus's built-in docsVersionDropdown feature. The implementation is straightforward and follows the desired placement. However, my review identified a critical dependency issue within the project's configuration. The project is configured to use React 19, which is incompatible with Docusaurus v3's requirement for React 18. This mismatch is likely to cause build or runtime errors, and it should be resolved to ensure the website's stability.

[gemini-code-assist]

While this change correctly adds the version dropdown, I've identified a critical dependency issue that will likely prevent it from working. The project's package.json specifies React version ^19.0.0, but the Docusaurus version used in this project (@docusaurus/core@3.7.0) has a peer dependency on React ^18.0.0.

This incompatibility will likely cause build failures or runtime errors for the entire site. To fix this, please downgrade react and react-dom in package.json to a version compatible with Docusaurus v3, such as ^18.0.0.