// you could use the invokable flag so you don't use the index

php artisan make:controller PagesController --invokable

// and then use this route:
Route::get('/{any?}', App\Http\Controllers\PagesController::class)->where('any', '.*');

// it tells Laravel routing to respond to any route provided or nothing with the question mark "?" and responds with an invokable controller

    public function __invoke()
        return view('welcome');
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