build: switch from yarn to npm to manage js dependencies and move js contents to root

yarn v1 is being deprecated and starts to have some issues

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

src/types/todos.ts

@@ -0,0 +1,12 @@
+import type { IActor, IPerson } from "@/types/actor";
+import { ITodoList } from "./todolist";
+
+export interface ITodo {
+  id?: string;
+  title: string;
+  status: boolean;
+  dueDate?: string;
+  creator?: IActor;
+  assignedTo?: IPerson;
+  todoList?: ITodoList;
+}