Add lightweight video embed for launch page

[daKmoR]

https://sia.codes/posts/lite-youtube-embed-eleventy/

[jorgecasar]

I also know https://github.com/justinribeiro/lite-youtube that is the ShadowDom web component version of Paul's lite-youtube-embed.

[daKmoR]

nice point 👍

We probably need to "fork" to a lit version so we can SSR it 🤔