Yarn workspaces

Summary:
1) moved "sonar/desktop/src" to "sonar/desktop/app/src", so "app" is now a separate package containing the core Flipper app code
2) Configured yarn workspaces with the root in "sonar/desktop": app, static, pkg, doctor, headless-tests. Plugins are not included for now, I plan to do this later.

Reviewed By: jknoxville

Differential Revision: D20535782

fbshipit-source-id: 600b2301960f37c7d72166e0d04eba462bec9fc1

desktop/app/src/ui/components/View.tsx

@@ -0,0 +1,27 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @format
+ */
+
+import styled from '@emotion/styled';
+
+type Props = {
+  grow?: boolean;
+  scrollable?: boolean;
+  maxHeight?: number;
+};
+
+const View = styled.div<Props>(props => ({
+  height: props.grow ? '100%' : 'auto',
+  overflow: props.scrollable ? 'auto' : 'visible',
+  position: 'relative',
+  width: props.grow ? '100%' : 'auto',
+  maxHeight: props.maxHeight,
+}));
+View.displayName = 'View';
+
+export default View;