Add Lotusdocs theme

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

@@ -0,0 +1,23 @@
+//Low light switcher
+const mode = document.getElementById('mode');
+
+if (mode !== null) {
+    window.matchMedia('(prefers-color-scheme: dark)').addEventListener('change', event => {
+        if (event.matches) {
+            localStorage.setItem('theme', 'dark');
+            document.documentElement.setAttribute('data-dark-mode', '');
+        } else {
+            localStorage.setItem('theme', 'light');
+            document.documentElement.removeAttribute('data-dark-mode');
+        }
+    })
+    mode.addEventListener('click', () => {
+        document.documentElement.toggleAttribute('data-dark-mode');
+        localStorage.setItem('theme', document.documentElement.hasAttribute('data-dark-mode') ? 'dark' : 'light');
+    });
+    if (localStorage.getItem('theme') === 'dark') {
+        document.documentElement.setAttribute('data-dark-mode', '');
+    } else {
+        document.documentElement.removeAttribute('data-dark-mode');
+    }
+}