refactor(Cypress): Moved Cypress to the main folder of the project, as I don't need a sub project for now.

node_modules/dayjs/esm/plugin/isLeapYear/index.d.ts

@@ -0,0 +1,10 @@
+import { PluginFunc } from 'dayjs/esm'
+
+declare const plugin: PluginFunc
+export = plugin
+
+declare module 'dayjs/esm' {
+  interface Dayjs {
+    isLeapYear(): boolean
+  }
+}