Let's create a Blueprint for WordPress contributors to:

• Reproduce issues that come with instructions such as "run this snippet of code"
• Write and test simple patches
• An empty mu-plugin.php – and redirect to it by default whenever Playground is loaded
• (bonus) export code changes as a patch that can be turned into a PR

There's a few ways to do it:

• Rely on the WordPress file editor
• Install a file editor plugin
• Run Playground Block inside Playground for its code editor – although the way it works can be highly confusing to new contributors.

Also, we'll need to enable networking, otherwise not every core WordPress feature works (e.g. the file editor) and that's confusing, too,.

cc @gziolo