Improve UI interactivity and remove unused code

Refactor Competencies component to use inline styles for icon colors on hover, remove unused useEffect import from Navbar, and remove deprecated color fields from Projects data.

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artifacts/joachim-portfolio/src/components/projects.tsx

@@ -4,7 +4,6 @@ import { ArrowUpRight, Lock, Mail, Zap, Database, BarChart2, Server } from "luci
 const projects = [
   {
     icon: Lock,
-    color: "from-blue-500 to-indigo-600",
     iconBg: "bg-blue-100 text-blue-600",
     title: "SafeDocs Portal",
     desc: "Sichere Upload-Plattform mit AES-256-GCM-Verschlüsselung, JWT-Auth, Passwort-Reset per E-Mail, Rate Limiting und Docker-Deployment.",
@@ -14,7 +13,6 @@ const projects = [
   },
   {
     icon: Mail,
-    color: "from-violet-500 to-purple-600",
     iconBg: "bg-violet-100 text-violet-600",
     title: "zensend.email",
     desc: "Newsletter & E-Mail-Marketing SaaS mit Double-Opt-In, DSGVO-Konformität, SPF/DKIM/DMARC, Zahlungsmodellen und Onboarding-Prozessen.",
@@ -24,7 +22,6 @@ const projects = [
   },
   {
     icon: Zap,
-    color: "from-amber-500 to-orange-500",
     iconBg: "bg-amber-100 text-amber-600",
     title: "KI-Automation mit n8n",
     desc: "Automatisierte Bildgenerierung, Lead-Prozesse, KI-gestützte Bildprüfung und API/Webhook-Workflows für echte Geschäftsprozesse.",
@@ -33,7 +30,6 @@ const projects = [
   },
   {
     icon: Database,
-    color: "from-emerald-500 to-teal-500",
     iconBg: "bg-emerald-100 text-emerald-600",
     title: "Eigene KI- & RAG-Systeme",
     desc: "PDF-Verarbeitung, Vektorisierung eigener Dokumente, Pinecone-Integration und eigene Wissensdatenbanken für KI-gestützte Recherche.",
@@ -42,7 +38,6 @@ const projects = [
   },
   {
     icon: BarChart2,
-    color: "from-orange-500 to-red-500",
     iconBg: "bg-orange-100 text-orange-600",
     title: "On-Premise Monitoring",
     desc: "Vollständige Monitoring-Stacks mit Grafana, Prometheus, Loki und Alloy auf Docker-Basis — transparent, nachvollziehbar, betreibbar.",