Add support for "outside elements" (Popups, Drawers, ...)

+ Add Drawer
+ Add new root in the HTML (should be included in production)

.storybook/preview-body.html

@@ -0,0 +1 @@
+<div id="detleph-fg-context"></div>

.storybook/preview-head.html

@@ -1,3 +1,22 @@
 <script>
   window.global = window;
 </script>
+
+<style>
+  body {
+    height: 100vh;
+  }
+
+  #detleph-fg-context {
+    width: 100%;
+    height: 100%;
+
+    position: relative;
+    overflow: hidden;
+  }
+
+  #detleph-fg-context:empty {
+    width: 0;
+    height: 0;
+  }
+</style>