Config path enhancements

[jannis-baum]

Close #181

[tuurep]

Thanks this is great, works with these configs in ~/.config/vivify/

.
├── config.json
├── scripts
│   ├── hello-world.js
│   └── toggle-hidden-files.js
└── styles.css

config.json:

{
    "pageTitle": "components.slice(-1)",
    "styles": "styles.css",
    "scripts": "scripts/*"
}

[jannis-baum]

Great, thanks! I forgot that we should document this as well in the customization guide. I'll add that when I'm back on my laptop and then I'll merge this.

[tuurep]

Oh, true