Errors in samples for CORS and bad requests

[damyanpetev]

As seen in
https://www.infragistics.com/products/ignite-ui-react/react/components/grids/hierarchical-grid/row-drag#example-demo

one being CORS-related:

Access to fetch at 'https://infragistics.com/react-demos/meta.json' from origin 'https://www.infragistics.com' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.

And the other being seemingly mime-type

installHook.js:1 SW Error during service worker registration: SecurityError: Failed to register a ServiceWorker for scope ('https://www.infragistics.com/react-demos//') with script ('https://www.infragistics.com/react-demos//service-worker.js'): The script has an unsupported MIME type ('text/html').

But it's actually 404 - the script request is just wrong and the samples browser returns the same "coming soon" placeholder page