Everywhere: Move the Ladybird folder to UI

Author: https://github.com/trflynn89
Commit: db47cc41f8
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/2256
Reviewed-by: https://github.com/sideshowbarker

Ladybird/AppKit/module.modulemap

@@ -1,19 +0,0 @@
-module Ladybird [system] {
-    requires cplusplus
-    requires objc_arc
-
-    explicit module WebView {
-        header "UI/LadybirdWebView.h"
-        export *
-    }
-
-    explicit module WebViewWindow {
-        header "UI/LadybirdWebViewWindow.h"
-        export *
-    }
-
-    explicit module WebViewApplication {
-        header "../../Libraries/LibWebView/Application.h"
-        export *
-    }
-}