FEATURE: Remove references to third-party CDNs from site head

[VincentTam]

Feature Request

Is your feature request related to a problem?

😥 Our project has several references to external scripts.

hugo-future-imperfect-slim/layouts/partials/scripts.html

Lines 8 to 10 in d36f889

	<script src="https://code.jquery.com/jquery-3.3.1.min.js"></script>
	<script src="https://cdnjs.cloudflare.com/ajax/libs/skel/3.0.1/skel.min.js"></script>
	<script src="https://cdnjs.cloudflare.com/ajax/libs/fancybox/3.3.5/jquery.fancybox.min.js"></script>

⚠️ This practice is not recommended by @onedrawingperday in the updated Theme Submission Guidelines in gohugoio/hugoThemes#668.

🖊️ I avoid putting links here so that our project won't be linked there.

Solution

Download the minified scripts and store the local copies under assets/static.

Additional Context

The aforementioned issue in https://github.com/gohugoio/hugoThemes.

[pacollins]

Additional solution might be include a useCDN param in the config.toml so that users can opt-in to the CDN, but also include assets.