feat: update package.json and add generate-barrel script

- Set project name to "nova-design-system" and updated version to 0.1.0
- Added description for the project
- Defined exports for the main entry and styles
- Included a new script "barrel" to generate index.ts for components
- Added "sass" as a devDependency

chore: update package-lock.json

- Added "sass" as a devDependency with version ^1.99.0
- Updated dependencies including @parcel/watcher and others

refactor: remove unused assets and Welcome component

- Deleted astro.svg and background.svg assets
- Removed Welcome.astro component as it was no longer needed

package.json

@@ -1,17 +1,32 @@
 {
-  "name": "",
+  "name": "nova-design-system",
   "type": "module",
-  "version": "0.0.1",
+  "version": "0.1.0",
+  "description": "Nova Design System — Astro component library",
   "engines": {
     "node": ">=22.12.0"
   },
+  "exports": {
+    ".": "./src/index.ts",
+    "./styles": "./src/styles/index.scss"
+  },
+  "files": [
+    "src"
+  ],
   "scripts": {
     "dev": "astro dev",
     "build": "astro build",
     "preview": "astro preview",
-    "astro": "astro"
+    "astro": "astro",
+    "barrel": "node scripts/generate-barrel.mjs"
+  },
+  "peerDependencies": {
+    "astro": ">=4.0.0"
   },
   "dependencies": {
     "astro": "^6.3.3"
+  },
+  "devDependencies": {
+    "sass": "^1.99.0"
   }
-}
+}