Add Font Awesome icons and refactor tech icon handling

- Added Font Awesome dependencies for enhanced icon support.
- Refactored tech icon components to utilize Font Awesome icons instead of custom SVGs.
- Updated skill data files to include icon properties for various technologies.
- Removed obsolete tech icon files to streamline the codebase.

data/skills/backend.json

@@ -6,6 +6,7 @@
       "id": "nodejs",
       "name": "Node.js",
       "description": "Runtime JavaScript côté serveur construit sur le moteur V8 de Chrome",
+      "icon": "fab-node",
       "links": [
         "https://nodejs.org/",
         "https://nodejs.org/en/docs/",
@@ -16,6 +17,7 @@
       "id": "python",
       "name": "Python",
       "description": "Langage de programmation interprété de haut niveau",
+      "icon": "fab-python",
       "links": [
         "https://www.python.org/",
         "https://docs.python.org/3/",
@@ -26,6 +28,7 @@
       "id": "express",
       "name": "Express.js",
       "description": "Framework web rapide, non-opinionated et minimaliste pour Node.js",
+      "icon": "fas-server",
       "links": [
         "https://expressjs.com/",
         "https://expressjs.com/en/guide/routing.html",
@@ -36,6 +39,7 @@
       "id": "postgresql",
       "name": "PostgreSQL",
       "description": "Système de gestion de base de données relationnelle open source",
+      "icon": "fas-database",
       "links": [
         "https://www.postgresql.org/",
         "https://www.postgresql.org/docs/",
@@ -46,6 +50,7 @@
       "id": "mongodb",
       "name": "MongoDB",
       "description": "Base de données NoSQL orientée document",
+      "icon": "fas-database",
       "links": [
         "https://www.mongodb.com/",
         "https://docs.mongodb.com/",
@@ -56,6 +61,7 @@
       "id": "redis",
       "name": "Redis",
       "description": "Structure de données en mémoire utilisée comme base de données, cache et broker de messages",
+      "icon": "fas-memory",
       "links": [
         "https://redis.io/",
         "https://redis.io/documentation",
@@ -66,24 +72,28 @@
       "id": "golang",
       "name": "Go",
       "description": "Langage de programmation développé par Google",
+      "icon": "fab-golang",
       "links": ["https://golang.org/", "https://golang.org/doc/"]
     },
     {
       "id": "rust",
       "name": "Rust",
       "description": "Langage de programmation système sûr et performant",
+      "icon": "fab-rust",
       "links": ["https://www.rust-lang.org/", "https://doc.rust-lang.org/"]
     },
     {
       "id": "java-spring",
       "name": "Java Spring",
       "description": "Framework Java pour applications d'entreprise",
+      "icon": "fab-java",
       "links": ["https://spring.io/", "https://docs.spring.io/"]
     },
     {
       "id": "csharp-dotnet",
       "name": "C# .NET",
       "description": "Plateforme de développement Microsoft",
+      "icon": "fab-microsoft",
       "links": [
         "https://dotnet.microsoft.com/",
         "https://docs.microsoft.com/dotnet/"
@@ -93,48 +103,56 @@
       "id": "php-laravel",
       "name": "PHP Laravel",
       "description": "Framework PHP moderne pour applications web",
+      "icon": "fab-php",
       "links": ["https://laravel.com/", "https://laravel.com/docs"]
     },
     {
       "id": "ruby-rails",
       "name": "Ruby on Rails",
       "description": "Framework web en Ruby",
+      "icon": "fas-code",
       "links": ["https://rubyonrails.org/", "https://guides.rubyonrails.org/"]
     },
     {
       "id": "graphql",
       "name": "GraphQL",
       "description": "Langage de requête pour APIs",
+      "icon": "fas-sitemap",
       "links": ["https://graphql.org/", "https://graphql.org/learn/"]
     },
     {
       "id": "prisma",
       "name": "Prisma",
       "description": "ORM moderne pour Node.js et TypeScript",
+      "icon": "fas-database",
       "links": ["https://www.prisma.io/", "https://www.prisma.io/docs"]
     },
     {
       "id": "trpc",
       "name": "tRPC",
       "description": "Framework TypeScript pour APIs type-safe",
+      "icon": "fas-plug",
       "links": ["https://trpc.io/", "https://trpc.io/docs"]
     },
     {
       "id": "nest-js",
       "name": "NestJS",
       "description": "Framework Node.js pour applications scalables",
+      "icon": "fas-layers",
       "links": ["https://nestjs.com/", "https://docs.nestjs.com/"]
     },
     {
       "id": "fastify",
       "name": "Fastify",
       "description": "Framework web rapide pour Node.js",
+      "icon": "fas-bolt",
       "links": ["https://www.fastify.io/", "https://www.fastify.io/docs/"]
     },
     {
       "id": "rabbitmq",
       "name": "RabbitMQ",
       "description": "Broker de messages open source",
+      "icon": "fas-stream",
       "links": [
         "https://www.rabbitmq.com/",
         "https://www.rabbitmq.com/documentation.html"
@@ -144,6 +162,7 @@
       "id": "apache-kafka",
       "name": "Apache Kafka",
       "description": "Plateforme de streaming distribuée",
+      "icon": "fas-broadcast",
       "links": [
         "https://kafka.apache.org/",
         "https://kafka.apache.org/documentation/"
@@ -153,6 +172,7 @@
       "id": "microservices",
       "name": "Microservices",
       "description": "Architecture en microservices",
+      "icon": "fas-boxes",
       "links": [
         "https://microservices.io/",
         "https://martinfowler.com/articles/microservices.html"