[Docs] Problem with getting-started/explaining-globs

[phated]

As discovered in #2275 (comment), there's an issue in node-glob where a directory passed to ignore (like our !node_modules/ example) doesn't actually exclude the folder from globbing. I'm not sure if this is a regression in node-glob but we should remove the example from the guide.

[plesiecki]

I think fast-glob is another option, it doesn't have node-glob issue