docs: generate and deploy for both v2 and v3

[tmlmt]

Description

Implemented versioned documentation support to maintain both v2 and v3 documentation simultaneously. This change allows users to access different versions of the documentation based on the release tag.

Key changes:

• Modified CI workflow to build and deploy both v2 (from main branch) and v3 (from release tag) documentation
• Added version detection logic to display appropriate version information
• Created a custom VitePress layout with a warning banner for pre-release versions
• Configured documentation base paths to support version-specific URLs
• Added version switcher in the navigation menu

Type of change

• New feature (non-breaking change which adds functionality)
• This change requires a documentation update

How Has This Been Tested?

• Verified documentation builds correctly for both v2 and v3 versions
• Tested version switcher navigation between documentation versions
• Confirmed pre-release banner displays correctly on alpha/beta versions

Checklist:

• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have run pnpm lint and my changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[tmlmt]

• docs: generate and deploy for both v2 and v3 #85 👈 (View in Graphite)
• chore(deps): bump vitepress to v2.0.0-alpha.15 #89
• main

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[tmlmt]

Merge activity

• Jan 13, 2:25 PM UTC: A user started a stack merge that includes this pull request via Graphite.
• Jan 13, 2:26 PM UTC: Graphite rebased this pull request as part of a merge.
• Jan 13, 2:27 PM UTC: @tmlmt merged this pull request with Graphite.