Autoloader could work using a CDN

[Golmote]

Is there an actual reason to prevent the autoloader from being loaded from an absolute URL? (cc @bazooka07)

By removing the second part of this condition, we could make the following work just fine:

<script src="https://cdn.jsdelivr.net/npm/prismjs@1.14.0/plugins/autoloader/prism-autoloader.js" data-autoloader-path="https://cdn.jsdelivr.net/npm/prismjs@1.14.0/components/"></script>

(See related #158 (comment))