Revert "[@portaljs/components][xl] - @portaljs/ckan package"

This reverts commit 91c76c213c.

examples/learn/pages/_app.tsx

@@ -1,8 +0,0 @@
-import '../styles/globals.css'
-import '@portaljs/components/styles.css'
-
-import type { AppProps } from 'next/app'
-
-export default function App({ Component, pageProps }: AppProps) {
-  return <Component {...pageProps} />
-}