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/histoire.setup.ts

@@ -0,0 +1,17 @@
+import { defineSetupVue3 } from "@histoire/plugin-vue";
+import { orugaConfig } from "./oruga-config";
+import { i18n } from "./utils/i18n";
+import Oruga from "@oruga-ui/oruga-next";
+import "@oruga-ui/oruga-next/dist/oruga-full-vars.css";
+import "./assets/tailwind.css";
+import "./assets/oruga-tailwindcss.css";
+import locale from "date-fns/locale/en-US";
+import MaterialIcon from "./components/core/MaterialIcon.vue";
+
+export const setupVue3 = defineSetupVue3(({ app }) => {
+  // Vue plugin
+  app.use(i18n);
+  app.use(Oruga, orugaConfig);
+  app.component("material-icon", MaterialIcon);
+  app.provide("dateFnsLocale", locale);
+});