Most code examples import non-existing index.css file

[mystoev]

Most of the code examples, for almost all components have a

import './index.css';

clause, without any CSS tab in the code view.

Here are a few examples:
https://www.infragistics.com/products/ignite-ui-react/react/components/grids/data-grid/accessibility#react-grid-accessible-example
https://www.infragistics.com/products/ignite-ui-react/react/components/inputs/badge#react-badge-example
https://www.infragistics.com/products/ignite-ui-react/react/components/menus/navigation-drawer#react-navigation-drawer-example
https://www.infragistics.com/products/ignite-ui-react/react/components/radial-gauge#react-radial-gauge-example
https://www.infragistics.com/products/ignite-ui-react/react/components/notifications/snackbar#ignite-ui-for-react-snackbar-example

Expected:
The index.css import should be removed, or of there are any styles, there should be a separate tab for that in the code view.

[HUSSAR-mtrela]

TODO: clean up CSS file on CDN that is used by all samples and update SB script to include this CSS file in the CSS tab of code-viewer