position the navbar above the inspector (#8356)

CLosing #8319

Playground/css/index.css

@@ -418,7 +418,7 @@ body {
     -ms-user-select: none;
     user-select: none;
     position: relative;
-    z-index: 5;
+    z-index: 11;
 }
 
 .navbar a {

dist/preview release/what's new.md

@@ -233,4 +233,4 @@
 - Sound's `updateOptions` takes `options.length` and `options.offset` as seconds and not milliseconds ([RaananW](https://github.com/RaananW))
 - HDRCubeTexture default rotation is now similar to the industry one. You might need to add a rotation on y of 90 degrees if you scene changes ([Sebavan](https://github.com/sebavan/))
 - PBRMaterial index of refraction is now defined as index of refraction and not the inverse of it ([Sebavan](https://github.com/sebavan/))
-- `SceneLoaderProgress` class is now `ISceneLoaderProgress` interface ([bghgary](https://github.com/bghgary))
+- `SceneLoaderProgress` class is now `ISceneLoaderProgress` interface ([bghgary](https://github.com/bghgary))