Generated CSS/JS

[viktorix]

As I'm removing minified files that will be generated during build, I noticed there are some directories with files that are missing from src directory in WP-CMS. They are most likely generated during build. This is a place to keep track of them:

• \src\wp-includes\css\dist\
  • Inside, at least one directory and files are related to blocks customize-widgets
  • The other is components, which might be block related too.
• \src\wp-includes\js
  • It's missing from WP-CMS src and is included in the release zip, but ClassicPress src does have it.

[viktorix]

Removed \src\wp-includes\css\dist\ in PR #42, no errors were observed anywhere in my tests.

[mattyrob]

As part of this piece of work we also need to figure out what we need and what we can drop, from the extensive list of files that are built upstream in Gruntfile.js as well as all of the files here:

https://github.com/WordPress/wordpress-develop/tree/trunk/tools/webpack

We will also need to work out how we bundle and maintain the files we need to keep.