Improve Google Slides embed size (#8282)
Improve Google Slides embed size (#8282)

Fixes https://github.com/devopsdays/devopsdays-web/issues/8077
https://getbootstrap.com/docs/4.0/utilities/embed/

I selected 16by9 as I assume that's the most popular aspect ratio for
slides.

This seems to work well with my testing.
gomex/devopsdays-web,gomex/devopsdays-web,gomex/devopsdays-web,gomex/devopsdays-web