Add homepage option to websites

[Signum21]

Is your feature request related to a problem? Please describe.
When creating a website with websites add-content -w mywebsite -c /path/ -r and trying to access the root path of the website from a browser, an error 404 will appear.

Describe the solution you'd like
It would be useful to have an option to specify a website homepage so that the request of the website root redirects to a file (eg: index.html)