Document Filament and Livewire usage in modules

[Amad3eu]

Adds README sections for two frequently asked questions:

• Filament (Filament Support #67, Creating Filament Resources #132): register a Filament plugin per module so resources are discovered from the module, with a link to Filament's modular architecture docs.
• Livewire (The "--module" option do not work for Livewire #72): note that make:livewire doesn't support --module, and show how to register module components manually.