Remove AppServiceProvider.php

[caendesilva]

The AppServiceProvider is not needed, and only handles changing the logo to a temporary one with the Ukrainian flag colours which can be handled in other places. The only benefit I see that it brings is that it gives a good point to configure application internals as it makes it clear that Hyde does in fact support service providers just the same a Laravel. Though I think this can easily be explained in documentation. And it does not fit in the 80% use case, and so I do not think it's worth having an entire directory that provides no real value to the majority of uses.