refactor: Rename app -> ui for clarity

Author: mmcknett

src/demo-react/ui.js src/demo-react/app.jssrc/demo-react/ui.js renamed to src/demo-react/app.js

@@ -3,6 +3,6 @@
 import React from 'react';
 import { render } from 'ink';
 
-import ui from './ui';
+import App from './app';
 
-render(React.createElement(ui));
+render(React.createElement(App));

src/demo-react/cli.js

@@ -1,5 +1,5 @@
 import React from 'react';
-import App from 'demo-react/ui';
+import App from 'demo-react/app';
 import { render } from 'ink-testing-library';
 import { expectRenderToMatchSnapshot } from './expect-render';