Migrate Privilege Secure Discovery KB to autogenerated sidebars

[hilram7]

Summary

Migrates Privilege Secure Discovery Knowledge Base to use Docusaurus autogenerated sidebars with icon grid category views. This is the sixth product migration following the infrastructure (#112), Threat Prevention (#117), Threat Manager (#118), Identity Recovery (#121), and Privilege Secure-AM (#122).

Also completes the infrastructure work by adding .gitignore pattern for "current" version products.

Changes Made

Privilege Secure Discovery KB Migration

• Added to MIGRATED_PRODUCTS: Privilege Secure Discovery now uses the new autogenerated sidebar system
• Sidebar config updated: Removed generateKBSidebar() call from current version
• KB content copied: Current version now has KB content with icon grid category views (34 files, 6 categories)
• Infrastructure fix: Added docs/*/kb/** pattern to .gitignore to cover "current" version products (completes infrastructure from PR Add KB sidebar migration infrastructure with Access Analyzer pilot #112)

Testing

✅ Local dev server: Privilege Secure Discovery KB displays correctly
✅ Production build: Completes successfully without errors
✅ Icon grid views: All 6 KB categories show with grid layout
✅ No duplicates: Only autogenerated KB section appears
✅ Current version: KB displays 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 (PR Migrate Identity Recovery KB to autogenerated sidebars  #121)
• ✅ Privilege Secure-AM (PR Migrate Privilege Secure-AM KB to autogenerated sidebars #122)
• ✅ Privilege Secure Discovery (this PR)

Remaining: 11 products