add smooth scroll to demo

package-lock.json

@@ -15,6 +15,7 @@
         "@vueuse/motion": "^3.0.3",
         "@wdns/vue-code-block": "^2.3.5",
         "gsap": "^3.13.0",
+        "lenis": "^1.3.8",
         "matter-js": "^0.20.0",
         "motion-v": "^1.5.0",
         "ogl": "^1.0.11",
@@ -6433,6 +6434,32 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/lenis": {
+      "version": "1.3.8",
+      "resolved": "https://registry.npmjs.org/lenis/-/lenis-1.3.8.tgz",
+      "integrity": "sha512-LVeoMs6jZE1eu3gPsexndm+vk01pLFeq7P00vjIpI17saD52IYu8nPA4gX43elz8tp/TTCXcX6Em1MEjDl9NTw==",
+      "license": "MIT",
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/darkroomengineering"
+      },
+      "peerDependencies": {
+        "@nuxt/kit": ">=3.0.0",
+        "react": ">=17.0.0",
+        "vue": ">=3.0.0"
+      },
+      "peerDependenciesMeta": {
+        "@nuxt/kit": {
+          "optional": true
+        },
+        "react": {
+          "optional": true
+        },
+        "vue": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/levn": {
       "version": "0.4.1",
       "resolved": "https://registry.npmjs.org/levn/-/levn-0.4.1.tgz",