List individual videos from a playlist

@javiervalino has requested in #7 (closed) that we list videos individually on the resources page to make it appear more plentiful.

We should do something similar to Jakarta EE, where we statically generate the list of videos during build time using YouTube's XML endpoint.

Since this is a recurring request, we should add a reusable shortcode in the Hugo Solstice Theme to provide this functionality without re-implementing the wheel. I'll create a separate issue for adding this shortcode to the theme.