Remove unused SSR module and remove first load fade (#835)

* disable SSR module in 11ty

* remove first load fade

docs/assets/scripts/theme-picker.js

@@ -1,8 +1,20 @@
+let initialPageLoadComplete = false;
+
+window.addEventListener('load', () => {
+  initialPageLoadComplete = true;
+});
+
 // Helper for view transitions
-export function domChange(fn, { behavior = 'smooth' } = {}) {
+export function domChange(fn, { behavior = 'smooth', ignoreInitialLoad = true } = {}) {
   const canUseViewTransitions =
     document.startViewTransition && !window.matchMedia('(prefers-reduced-motion: reduce)').matches;
 
+  // Skip transitions on initial page load
+  if (!initialPageLoadComplete && ignoreInitialLoad) {
+    fn(false);
+    return null;
+  }
+
   if (canUseViewTransitions && behavior === 'smooth') {
     const transition = document.startViewTransition(() => {
       fn(true);
@@ -10,6 +22,9 @@ export function domChange(fn, { behavior = 'smooth' } = {}) {
       return new Promise(resolve => setTimeout(resolve, 200));
     });
     return transition;
+  } else {
+    fn(false);
+    return null;
   }
 }