feat(knapsack): add new demo for outlined button

Add a new demo for an outlined button in the knapsack app. The demo includes the necessary data and properties for the button, such as the label, trailing icon, and icon type. This addition enhances the available options for button customization in the app.

apps/knapsack/data/demos/demo.E5ymzzEPs.json

@@ -0,0 +1,22 @@
+{
+  "id": "E5ymzzEPs",
+  "title": "Outlined",
+  "type": "data",
+  "patternId": "button",
+  "templateId": "web-components-raE1x4tYL",
+  "data": {
+    "props": {
+      "label": "Label",
+      "trailingIcon": true,
+      "raised": false,
+      "unelevated": false,
+      "outlined": true,
+      "dense": false,
+      "disabled": false,
+      "expandContent": false,
+      "fullwidth": false,
+      "icon": "add"
+    },
+    "slots": {}
+  }
+}