[BUG] YouTube videos break out of their container width

[jjsanderson]

Describe the bug
A video embedded from YouTube breaks out of the container width, spanning to the right of the window.

To Reproduce
Steps to reproduce the behaviour:

1. Add a video component, referencing a YouTube URL
2. Publish page, view page as served.
3. See huge video spanning to the right of the window.

Expected behaviour
Videos have consistent widths, irrespective of source (ie. locally-hosted or embedded from third-party site).

Additional context
Video embed size is a really common issue for Wordpress themes, and the web in general. It's often useful to be able to force 4:3 or 16:9 embed size ratios, though neither can be relied upon. On occasion, YouTube will do something utterly insane, like serve a 16:9 video letterboxed in a 4:3 frame but labeled as 16:9 content. Ugh.

[jjsanderson]

Looks like a fix here might be as simple as:

in includes/theme-supports.php add line to benenson_theme_support():

add_theme_support( 'responsive-embeds' );

reference: https://developer.wordpress.org/block-editor/developers/themes/theme-support/#responsive-embedded-content

Tricky for me to test robustly, but seems to be solving issues for me locally.