Migrate Identity Recovery KB to autogenerated sidebars

[hilram7]

Summary

Migrates Identity Recovery (Recovery for Active Directory) Knowledge Base to use Docusaurus autogenerated sidebars with icon grid category views. This is the fourth product migration following the infrastructure (#112), Threat Prevention (#117), and Threat Manager (#118).

Changes Made

Identity Recovery KB Migration

• Added to MIGRATED_PRODUCTS: Identity Recovery (recoveryforactivedirectory) now uses the new autogenerated sidebar system
• Sidebar configs updated: Removed generateKBSidebar() calls from both versions (2.6, 3.1)
• KB content copied: Versions 2.6 and 3.1 now have KB content with icon grid category views (12 files, 3 categories per version)
• Index page updated: Removed version-specific text ("version 2.6" references) to make content generic across all versions

Testing

✅ Local dev server: Identity Recovery KB displays correctly
✅ Production build: Completes successfully without errors
✅ Icon grid views: All 3 KB categories show with grid layout
✅ No duplicates: Only autogenerated KB section appears
✅ Versions 2.6 and 3.1: Both show KB correctly
✅ No conflicts with previous migrations

Migration Status

Completed:

• ✅ Access Analyzer (infrastructure PR Add KB sidebar migration infrastructure with Access Analyzer pilot #112)
• ✅ Threat Prevention (PR Migrate Threat Prevention KB to autogenerated sidebars  #117)
• ✅ Threat Manager (PR Migrate Threat Manager KB to autogenerated sidebars #118)
• ✅ Identity Recovery (this PR)

Remaining: 13 products