remove spinner.webp, and change .gitignore

.gitignore

@@ -2,7 +2,7 @@
 .user.ini
 .vscode
 photostandard.txt
-sitemap
+sitemap.xml
 images/20*
 migrate.php
 config.php

assets/css/error.css

@@ -17,18 +17,16 @@ h1, h2, h3, h4, h5, h6 {
     margin: 0.5em 0;
 }
 
-/* Optional: add a subtle overlay for better contrast */
 body::before {
     content: "";
     position: fixed;
     top: 0; left: 0;
     width: 100%;
     height: 100%;
-    background: rgba(0,0,0,0.4); /* dark overlay for contrast */
+    background: rgba(0,0,0,0.4);
     z-index: 0;
 }
 
-/* Ensure content is above overlay */
 h1, h2, h3, h4, h5, h6 {
     position: relative;
     z-index: 1;