In Ghost there are some beta features. Officially these features may change, break or inexplicably disappear at any time. But these features are really very solid and these bring a superior degree of customization options within Ghost.
This is a very usable and handy feature. If you enable this option your entire site will become dark. This feature is specially helpful for those who spend long time staring at computer screen, it lessen the stress on your eyes.
Using this option you can setup redirects for your old or moved content, so that if your user visits your old or moved content link then that user will be redirect to you the new place according to your redirect option setup. You can find more information about redirect in Ghost documentation.
The routs option is really is an awesome feature. Using this you can organization your contents as you want. It really has endless possibility. Read more about this feature here.