Add Mockup browser component (#3276)

shared/data/docs.json

@@ -254,6 +254,10 @@
 							"title": "Modal",
 							"url": "/ui/components/modal"
 						},
+						{
+							"title": "Mockup browser",
+							"url": "/ui/components/mockup-browser"
+						},
 						{
 							"title": "Nav overflow",
 							"url": "/ui/components/nav-overflow"

shared/data/menu.json

@@ -190,6 +190,11 @@
         "url": "modals.html",
         "title": "Modals"
       },
+      "mockup-browser": {
+        "url": "mockup-browser.html",
+        "title": "Mockup browser",
+        "badge": "New"
+      },
       "prose": {
         "title": "Prose",
         "url": "prose.html"