feat: add Bugs & Fixes category to documentation

Added new "Bugs" group to release notes system for documenting
bug fixes and troubleshooting guides.

Changes:
- Added "Bugs & Fixes" group to _index.json (order: 4)
- Added "webpack-module-resolution" category under bugs group
- Created comprehensive MDX documentation for webpack fix
- Updated TypeScript types to include 'bugs' as valid group
- Updated sort order in getAllReleases() function
- Updated getReleasesGrouped() to include bugs filter
- Updated sidebar to expand bugs group by default

Content:
- Detailed webpack module resolution bug documentation
- Root cause analysis with technical explanation
- Solution implementation with code examples
- Prevention best practices
- Quick reference troubleshooting table
- Related issues and future improvements

Structure:
Group: Bugs & Fixes (order: 4)
└── Webpack Module Resolution (order: 10)
    - Error: Cannot read properties of undefined (reading 'call')
    - Fix: Wrapper component pattern
    - Status: Completed
    - Version: 0.2.1

This creates a dedicated space for documenting production issues,
their solutions, and lessons learned for future reference.

content/nl/releases/_index.json

@@ -17,6 +17,12 @@
       "title": "Infrastructure",
       "description": "Ondersteunende systemen",
       "order": 3
+    },
+    {
+      "id": "bugs",
+      "title": "Bugs & Fixes",
+      "description": "Opgeloste bugs en troubleshooting",
+      "order": 4
     }
   ],
   "categories": [
@@ -82,6 +88,13 @@
       "group": "infrastructure",
       "description": "Optimalisaties en monitoring",
       "order": 9
+    },
+    {
+      "slug": "webpack-module-resolution",
+      "title": "Webpack Module Resolution",
+      "group": "bugs",
+      "description": "Fix voor Server/Client Component import issues",
+      "order": 10
     }
   ]
 }