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/backend.json

@@ -66,28 +66,19 @@
       "id": "golang",
       "name": "Go",
       "description": "Langage de programmation développé par Google",
-      "links": [
-        "https://golang.org/",
-        "https://golang.org/doc/"
-      ]
+      "links": ["https://golang.org/", "https://golang.org/doc/"]
     },
     {
       "id": "rust",
       "name": "Rust",
       "description": "Langage de programmation système sûr et performant",
-      "links": [
-        "https://www.rust-lang.org/",
-        "https://doc.rust-lang.org/"
-      ]
+      "links": ["https://www.rust-lang.org/", "https://doc.rust-lang.org/"]
     },
     {
       "id": "java-spring",
       "name": "Java Spring",
       "description": "Framework Java pour applications d'entreprise",
-      "links": [
-        "https://spring.io/",
-        "https://docs.spring.io/"
-      ]
+      "links": ["https://spring.io/", "https://docs.spring.io/"]
     },
     {
       "id": "csharp-dotnet",
@@ -102,64 +93,43 @@
       "id": "php-laravel",
       "name": "PHP Laravel",
       "description": "Framework PHP moderne pour applications web",
-      "links": [
-        "https://laravel.com/",
-        "https://laravel.com/docs"
-      ]
+      "links": ["https://laravel.com/", "https://laravel.com/docs"]
     },
     {
       "id": "ruby-rails",
       "name": "Ruby on Rails",
       "description": "Framework web en Ruby",
-      "links": [
-        "https://rubyonrails.org/",
-        "https://guides.rubyonrails.org/"
-      ]
+      "links": ["https://rubyonrails.org/", "https://guides.rubyonrails.org/"]
     },
     {
       "id": "graphql",
       "name": "GraphQL",
       "description": "Langage de requête pour APIs",
-      "links": [
-        "https://graphql.org/",
-        "https://graphql.org/learn/"
-      ]
+      "links": ["https://graphql.org/", "https://graphql.org/learn/"]
     },
     {
       "id": "prisma",
       "name": "Prisma",
       "description": "ORM moderne pour Node.js et TypeScript",
-      "links": [
-        "https://www.prisma.io/",
-        "https://www.prisma.io/docs"
-      ]
+      "links": ["https://www.prisma.io/", "https://www.prisma.io/docs"]
     },
     {
       "id": "trpc",
       "name": "tRPC",
       "description": "Framework TypeScript pour APIs type-safe",
-      "links": [
-        "https://trpc.io/",
-        "https://trpc.io/docs"
-      ]
+      "links": ["https://trpc.io/", "https://trpc.io/docs"]
     },
     {
       "id": "nest-js",
       "name": "NestJS",
       "description": "Framework Node.js pour applications scalables",
-      "links": [
-        "https://nestjs.com/",
-        "https://docs.nestjs.com/"
-      ]
+      "links": ["https://nestjs.com/", "https://docs.nestjs.com/"]
     },
     {
       "id": "fastify",
       "name": "Fastify",
       "description": "Framework web rapide pour Node.js",
-      "links": [
-        "https://www.fastify.io/",
-        "https://www.fastify.io/docs/"
-      ]
+      "links": ["https://www.fastify.io/", "https://www.fastify.io/docs/"]
     },
     {
       "id": "rabbitmq",