New footer (#2988)

* Update footer to new design

* Update footer with changelog and security notice

* Move mastodon icon

* Make full-width instead of card

* Intl extract, lint

packages/ui/src/locales/en-US/index.json

@@ -32,6 +32,9 @@
   "button.upload-image": {
     "defaultMessage": "Upload image"
   },
+  "changelog.justNow": {
+    "defaultMessage": "Just now"
+  },
   "changelog.product.api": {
     "defaultMessage": "API"
   },