Remove inline javascript to comply with some CSP

[mossroy]

https://download.kiwix.org/zim/phet/phet_fr_2021-08.zim can not be used inside a Chrome/Chromium extension, because of the CSP the browser engine enforces.

The main page loads, but you're stuck on it as no category is displayed :

Refused to execute inline script because it violates the following Content Security Policy directive: "script-src 'self' 'unsafe-eval'". Either the 'unsafe-inline' keyword, a hash ('sha256-h1G5vTT/RuoHFKih3ibsUNr2b7WX7UpZMbYt5ioKXWc='), or a nonce ('nonce-...') is required to enable inline execution.

It is (at least) because of this inline javascript :

<script>
	window.importedData = (...)

	window.lsPrefix = 'kiwix';

	lsPrefix = "phet_fr_2021-08";

</script>

This inline javascript (and any other inline javascript) should be moved inside a javascript file to be compatible with the CSP.