feat: check for custom root in config on dashboard index

[Tao-Galasse]

Hello @spohlenz !

Here is a little POC to fix a recent issue which I think should be improved. It's probably not the cleanest way to do it, but I wanted to provide an example of how we could find a solution.

Currently, Trestle do not use the value set in config.root as the default redirected route of the application.

For example, if you defined a root which is not the one with the highest priority, it will be used as the "home" in the breadcrumb, but will not be the view displayed when accessing the base URL of the back office.

IMHO, those two values should be the same, what is defined as the "root" should be the default view.

Do you have any opinion about this ?

[coveralls]

Coverage decreased (-0.03%) to 90.964% when pulling 94c7a46 on Tao-Galasse:dashboard-index-root into 31cac2e on TrestleAdmin:master.