Add Lotusdocs theme

themes/lotusdocs/assets/docs/js/darkmode-init.js

@@ -0,0 +1,15 @@
+const globalDark = window.matchMedia && window.matchMedia('(prefers-color-scheme: dark)').matches;
+const localMode = localStorage.getItem('theme');
+
+if (globalDark && (localMode === null)) {
+  localStorage.setItem('theme', 'dark');
+  document.documentElement.setAttribute('data-dark-mode', '');
+}
+
+if (globalDark && (localMode === 'dark')) {
+  document.documentElement.setAttribute('data-dark-mode', '');
+}
+
+if (localMode === 'dark') {
+  document.documentElement.setAttribute('data-dark-mode', '');
+}