added support for inviting list collaborators

database/migrations/0001_01_01_000000_create_users_table.php

@@ -16,7 +16,7 @@ return new class extends Migration
             $table->string('username')->unique();
             $table->string('email')->unique();
             $table->timestamp('email_verified_at')->nullable();
-            $table->string('password');
+            $table->string('password')->nullable();
             $table->rememberToken();
             $table->timestamps();
         });