Switch from codemirror to prism

[Wolfr]

I implemented a version of Bedrock where codemirror is out and prism is in: https://github.com/usebedrock/bedrock/tree/feature/prism-code-blocks

This necessitated some changes to the Browserify/Babel setup, which is more modern now 🙌 . Don't you love how one problem solves another?

In https://github.com/usebedrock/bedrock/tree/feature/browserify-direct I set up Bedrock to load a .babel.config.js (defined in the root of the project), with content similar to this:

  "presets": [
    ["@babel/preset-env"]
  ],
  "plugins": [
    ["prismjs", {
        "languages": ["markup", "pug"],
        "theme": "ghcolors"
    }]
  ]
}

I guess we could split up the config to compile the front-end JS and the prototype JS with 2 different configs, but rolling with this for now to test-drive it.

[Wolfr]

This is fixed in 1.39.0 (pre-release).