feat(ui): modularisation du css et fidélisation des composants à la maquette figma

- découpage du css par composant (navbar, hero, footer, global)
- ajustement pixel-perfect du footer (newsletter full-bleed, alignements, typographies)
- documentation et commentaires détaillés du code react et css

symfony.lock

@@ -319,6 +319,31 @@
             "./config/packages/messenger.yaml"
         ]
     },
+    "symfony/webpack-encore-bundle": {
+        "version": "2.4",
+        "recipe": {
+            "repo": "github.com/symfony/recipes",
+            "branch": "main",
+            "version": "2.2",
+            "ref": "b618bf5f17ed61f523da7153025bf58ec9502f65"
+        },
+        "files": [
+            "./assets/app.js",
+            "./assets/styles/app.css",
+            "./config/packages/webpack_encore.yaml",
+            "./package.json",
+            "./webpack.config.js"
+        ]
+    },
+    "symfonycasts/tailwind-bundle": {
+        "version": "1.0",
+        "recipe": {
+            "repo": "github.com/symfony/recipes",
+            "branch": "main",
+            "version": "0.14",
+            "ref": "b8af60cec7149fd0cde0ec9d89ccb32335c4d9bd"
+        }
+    },
     "twig/extra-bundle": {
         "version": "v3.29.0"
     }