generic error handler in `config.js`

[lduport]

Hi,

Thank you for the work done on this project. It taught me a lot!

I would like to know more about the config.js that you are refering to in the site.js highlightErrors function.

// (Hopefully) caught by the generic error handler in config.js.

Is the file missing from the solution ?

[lduport]

@jbogard any chance you could give some answers ? ._.