Add a draft page for Previews and Blueprints

[tellyworth]

Should fix #4.

[colorful-tones]

@tellyworth can we confirm that this is the final page impacted here please? https://developer.wordpress.org/plugins/wordpress-org/previews-and-blueprints/

[flexseth]

@tellyworth can we confirm that this is the final page impacted here please? https://developer.wordpress.org/plugins/wordpress-org/previews-and-blueprints/

That's the correct page, however...

There is an error in this page. It's been reported, on Friday I can do my best to get it fixed in a meeting with the Playground architect...

{
"step": "runPHP",
"code": " 5,\n'post_title' => 'Example Post',\n'post_content' => '

• Advanced blueprint.json code block incomplete wordpress-playground#1110

@tellyworth - Do you happen to have the remainder of the snippet seen here on the PR?

(Sorry for the duplicate ping but it's a pretty critical part of the docs I'm trying to track down) :)

[flexseth]

@tellyworth - PR to fix the documentation based on my comment directly above this one

This matches the Devhub docs at https://developer.wordpress.org/plugins/wordpress-org/previews-and-blueprints/
to relevant documentation
https://wordpress.github.io/wordpress-playground/api/blueprints/interface/RunPHPStep/

• Updated "advanced blueprint" example to match Playground documentation #7

cc: @colorful-tones, @adamziel