Scaffold containerized Django/Wagtail app with core features

static/js/theme.js

@@ -0,0 +1,7 @@
+(function () {
+  window.toggleTheme = function toggleTheme() {
+    const root = document.documentElement;
+    root.classList.toggle('dark');
+    localStorage.setItem('theme', root.classList.contains('dark') ? 'dark' : 'light');
+  };
+})();