Add skill removal functionality and enhance UI components

- Integrated onRemoveSkill functionality in SkillEvaluation, SkillSelector, and SkillEvaluationCard components for better skill management.
- Updated UI to improve user experience when removing skills, including tooltip descriptions and styling adjustments.
- Added new skills to backend, devops, frontend, and mobile JSON files for comprehensive skill coverage.

lib/category-icons.ts

@@ -2,7 +2,11 @@ import {
   Monitor, 
   Server, 
   Settings, 
-  Smartphone, 
+  Smartphone,
+  Database,
+  Cloud,
+  Shield,
+  Palette,
   LucideIcon 
 } from "lucide-react";
 
@@ -11,6 +15,10 @@ const CATEGORY_ICON_MAP: Record<string, LucideIcon> = {
   server: Server,
   settings: Settings,
   smartphone: Smartphone,
+  database: Database,
+  cloud: Cloud,
+  shield: Shield,
+  palette: Palette,
 };
 
 export function getCategoryIcon(iconName: string): LucideIcon {