Add demo data back

demo_data/panel_data.js

@@ -0,0 +1,48 @@
+export default {
+  'dev-event': {
+    component_name: 'dev-event',
+    url: '/demo/panels/ha-panel-dev-event.html',
+    url_name: 'dev-event',
+  },
+  'dev-info': {
+    component_name: 'dev-info',
+    url: '/demo/panels/ha-panel-dev-info.html',
+    url_name: 'dev-info',
+  },
+  'dev-service': {
+    component_name: 'dev-service',
+    url: '/demo/panels/ha-panel-dev-service.html',
+    url_name: 'dev-service',
+  },
+  'dev-state': {
+    component_name: 'dev-state',
+    url: '/demo/panels/ha-panel-dev-state.html',
+    url_name: 'dev-state',
+  },
+  'dev-template': {
+    component_name: 'dev-template',
+    url: '/demo/panels/ha-panel-dev-template.html',
+    url_name: 'dev-template',
+  },
+  history: {
+    component_name: 'history',
+    icon: 'mdi:poll-box',
+    title: 'History',
+    url: '/demo/panels/ha-panel-history.html',
+    url_name: 'history',
+  },
+  logbook: {
+    component_name: 'logbook',
+    icon: 'mdi:format-list-bulleted-type',
+    title: 'Logbook',
+    url: '/demo/panels/ha-panel-logbook.html',
+    url_name: 'logbook',
+  },
+  map: {
+    component_name: 'map',
+    icon: 'mdi:account-location',
+    title: 'Map',
+    url: '/demo/panels/ha-panel-map.html',
+    url_name: 'map',
+  },
+};