Add --force flag to allow the user to regenerate board file if it alr…

…eady exists mokhosh#59

Instead of removing the kanban board file then run the command again, user can add --force and voila!

src/Commands/MakeKanbanBoardCommand.php

@@ -6,12 +6,12 @@
 
 class MakeKanbanBoardCommand extends GeneratorCommand
 {
-    public $name = 'make:kanban';
-
     public $description = 'Create a filament kanban board page';
 
     public $type = 'Kanban page';
 
+    protected $signature = 'make:kanban {name} {--force : Force kanban board to recreated}';
+
     protected function getStub()
     {
         return file_exists($customPath = $this->laravel->basePath('/stubs/filament-kanban/board.stub'))