Undocumented Node version requirements

[tomjn]

Authorship specifies no Node requirements, and will fail if using modern NodeJS. To fix this the package.json should specify the range of Node versions that are supported in the engines section, and it should be mentioned in the readme file

[johnbillion]

It's in the .nvmrc file but nowhere else. The whole Node setup needs updating to Node 20 too.

[roborourke]

Updating to node 20 is a huge rabbit hole.

I tried making a start and I think my recommendation is a to update the build tooling to use wp-scripts instead, as well as it's eslint, stylelint and other configs. Updating the HM webpack helpers and coding standards is too difficult at this point IMO.

We will need to remove react-sortable-hoc with @dnd-kit as well because the former is no longer maintained.

[johnbillion]

As Rob pointed out, the GitHub Actions workflow for the build is not failing either, everything is green. Needs looking into.