Tidy up homepage and navigation

app/javascript/controllers/mobile_menu_controller.js

@@ -0,0 +1,17 @@
+import { Controller } from "@hotwired/stimulus"
+
+export default class extends Controller {
+  static targets = ["menu", "open", "close"]
+
+  toggle(event) {
+    event.preventDefault()
+
+    const menu = this.menuTarget
+    const openIcon = this.openTarget
+    const closeIcon = this.closeTarget
+
+    menu.classList.toggle("hidden")
+    openIcon.classList.toggle("hidden")
+    closeIcon.classList.toggle("hidden")
+  }
+}