Refactor radar chart and improve UI elements

- Updated radar chart to use abbreviated category labels for better readability.
- Enhanced chart visibility with improved grid and axis styling.
- Added a gradient background to the radar area for a more polished look.
- Simplified links in JSON files for backend, cloud, and devops skills.
- Adjusted HomePage text for clarity and consistency.

data/skills/devops.json

@@ -66,19 +66,13 @@
       "id": "ansible",
       "name": "Ansible",
       "description": "Outil d'automatisation IT et de gestion de configuration",
-      "links": [
-        "https://www.ansible.com/",
-        "https://docs.ansible.com/"
-      ]
+      "links": ["https://www.ansible.com/", "https://docs.ansible.com/"]
     },
     {
       "id": "jenkins",
       "name": "Jenkins",
       "description": "Serveur d'automatisation open source",
-      "links": [
-        "https://www.jenkins.io/",
-        "https://www.jenkins.io/doc/"
-      ]
+      "links": ["https://www.jenkins.io/", "https://www.jenkins.io/doc/"]
     },
     {
       "id": "gitlab-ci",
@@ -93,19 +87,13 @@
       "id": "prometheus",
       "name": "Prometheus",
       "description": "Système de monitoring et d'alerting",
-      "links": [
-        "https://prometheus.io/",
-        "https://prometheus.io/docs/"
-      ]
+      "links": ["https://prometheus.io/", "https://prometheus.io/docs/"]
     },
     {
       "id": "grafana",
       "name": "Grafana",
       "description": "Plateforme de visualisation et monitoring",
-      "links": [
-        "https://grafana.com/",
-        "https://grafana.com/docs/"
-      ]
+      "links": ["https://grafana.com/", "https://grafana.com/docs/"]
     },
     {
       "id": "elk-stack",
@@ -120,46 +108,31 @@
       "id": "nginx",
       "name": "Nginx",
       "description": "Serveur web et proxy inverse",
-      "links": [
-        "https://nginx.org/",
-        "https://nginx.org/en/docs/"
-      ]
+      "links": ["https://nginx.org/", "https://nginx.org/en/docs/"]
     },
     {
       "id": "apache",
       "name": "Apache HTTP Server",
       "description": "Serveur web open source",
-      "links": [
-        "https://httpd.apache.org/",
-        "https://httpd.apache.org/docs/"
-      ]
+      "links": ["https://httpd.apache.org/", "https://httpd.apache.org/docs/"]
     },
     {
       "id": "traefik",
       "name": "Traefik",
       "description": "Proxy inverse moderne et load balancer",
-      "links": [
-        "https://traefik.io/",
-        "https://doc.traefik.io/"
-      ]
+      "links": ["https://traefik.io/", "https://doc.traefik.io/"]
     },
     {
       "id": "helm",
       "name": "Helm",
       "description": "Gestionnaire de packages pour Kubernetes",
-      "links": [
-        "https://helm.sh/",
-        "https://helm.sh/docs/"
-      ]
+      "links": ["https://helm.sh/", "https://helm.sh/docs/"]
     },
     {
       "id": "istio",
       "name": "Istio",
       "description": "Service mesh pour microservices",
-      "links": [
-        "https://istio.io/",
-        "https://istio.io/latest/docs/"
-      ]
+      "links": ["https://istio.io/", "https://istio.io/latest/docs/"]
     },
     {
       "id": "vault",
@@ -174,10 +147,7 @@
       "id": "consul",
       "name": "HashiCorp Consul",
       "description": "Service discovery et configuration",
-      "links": [
-        "https://www.consul.io/",
-        "https://learn.hashicorp.com/consul"
-      ]
+      "links": ["https://www.consul.io/", "https://learn.hashicorp.com/consul"]
     },
     {
       "id": "nomad",