Migrate PostInstall Laravel Prompts (#348)

* migrate post install script to laravel prompts

* combine `str_replace` calls

* require laravel prompts

* require laravel 10 instead of just the prompts

* extract stuff to its own methods

* remove default for app name but require it

* rearrange methods

* add spinner for processes

* add default for app name (temporary fix)

* add success message for after overwriting the .env file

* restore interactivity for prompts

* remove trailing commas

* set sensible defaults

* use new LaravelLang stuff

* reimplement previous laravel lang installation