Add ScalarDB 3.16 docs

[josh-wong]

Description

This PR:

• Adds ScalarDB 3.16 docs as the latest version.
• Moves the ScalarDB 3.15 docs to a versioned folder.

Related issues and/or PRs

• Added docs for ScalarDB 3.16 as the latest version for English and Japanese docs.
• Moved the docs for ScalarDB 3.15 to a versioned folder for English and Japanese docs.

Changes made

Outline the specific changes made in this pull request. Include relevant details, such as added features, bug fixes, code refactoring, or improvements.

Checklist

The following is a best-effort checklist. If any items in this checklist are not applicable to this PR or are dependent on other, unmerged PRs, please still mark the checkboxes after you have read and understood each item.

• I have updated the side navigation as necessary.
• I have commented my code, particularly in hard-to-understand areas.
• I have updated the documentation to reflect the changes.
• Any remaining open issues linked to this PR are documented and up-to-date (Jira, GitHub, etc.).
• My changes generate no new warnings.
• Any dependent changes in other PRs have been merged and published.

Additional notes (optional)

N/A

[gemini-code-assist]

Summary of Changes

Hello @josh-wong, 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 primarily focuses on updating the ScalarDB documentation to reflect the release of version 3.16. It involves promoting the new version's content as the latest and archiving the previous version's documentation, along with necessary configuration adjustments to the documentation platform.

Highlights

• Documentation Promotion: The ScalarDB 3.16 documentation has been promoted to be the 'latest' and 'current' version across the English and Japanese sites.
• Version Archiving: The previous ScalarDB 3.15 documentation has been moved into a dedicated versioned folder, ensuring historical access while keeping the main site up-to-date.
• Release Notes Update: Detailed release notes for ScalarDB 3.16.0 have been added, highlighting numerous enhancements (e.g., IBM Db2 support, new scanner API, read-only transactions, one-phase commit optimization), improvements, and bug fixes for both Community and Enterprise editions.
• Configuration and UI Updates: The Docusaurus configuration has been updated to reflect the new versioning, including changes to the navigation, language dropdown, and the site's announcement bar to notify users of the 3.16 release.

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[gemini-code-assist]

Code Review

This pull request updates the documentation for the ScalarDB 3.16 release. The changes include updating release notes, versioning the 3.15 documentation, and updating configuration files. I have identified some issues with links and a recommendation to use backticks for string literals. Addressing these points will ensure the documentation is accurate.