Refresh China Video Block plugin

[cjyabraham]

To celebrate its 10,000 download, test and refresh the China Video Block plugin to make sure it's working and useful to both us and other people.

[cjyabraham]

FYI, I have removed this plugin from our codebases since it wasn't being used and we didn't want to continue our subscription to ipinfo.

If we decide to work on this more, we could use the new way of testing for geolocation that doesn't require ipinfo. Ipinfo was proving not very effective as it is since privacy blocking plugins were blocking it.

[thetwopct]

@cjyabraham I've done some work on this:

• modernised the plugin - dropped Create Guten Block and instead used the wp-scripts package, make more use of block.json
• switched from SCSS to plain CSS
• Added some block features like alignment, custom classnames and anchor points
• added some wordpress.org assets (icons and banners) plus a blueprint (needs some testing)
• Added wp-env to quickly spin up a dev site, added sniff checking/fixing via composer
• Added a GitHub workflow to compile a zip for testing on each branch / PR

I'll leave it to you to release on wordpress.org - if you need to automate the releasing I have a GitHub workflow that can deploy to the org repo.