title: Angular 6 - Refused to apply style from '...' because its MIME type ('text/html') is not a supported stylesheet
body: <p>Trying to upgrade to Angular 6 and got the below error when I referred the below in index.html:
  <strong></strong></p>
  
  <p>Refused to apply style from '<a href="https://localhost:44394/~/assets/primengcss/themes/omega//theme.css" rel="noreferrer">https://localhost:44394/~/assets/primengcss/themes/omega//theme.css</a>' because its MIME type ('text/html') is not a supported stylesheet MIME type, and strict MIME checking is enabled.</p>