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>

tests/unit/specs/mocks/matchMedia.ts

@@ -0,0 +1,12 @@
+import { vi } from "vitest";
+
+vi.stubGlobal("matchMedia", (query: string) => ({
+  matches: false,
+  media: query,
+  onchange: null,
+  addListener: vi.fn(), // deprecated
+  removeListener: vi.fn(), // deprecated
+  addEventListener: vi.fn(),
+  removeEventListener: vi.fn(),
+  dispatchEvent: vi.fn(),
+}));