Add ScalarDB 3.14 docs

[josh-wong]

Caution

This PR should not be merged until the 3.14 docs are ready.

Description

This PR adds ScalarDB 3.14 docs and moves ScalarDB 3.13 docs to a versioned folder.

Related issues and/or PRs

N/A

Changes made

• ==Added docs for 3.14.==
• Moved docs for 3.13 into a version folder (versioned_docs/version-3.13), according to the Docusaurus versioning instructions.
• Added a homepage component for 3.14 and the version dropdown menu.

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