Add favicon configuration to Caddyfile

- Added favicon.ico redirect to favicon.png (301 redirect)
- Added favicon.png serving from /app/dist directory
- This fixes favicon loading issues in browsers
- Both favicon.ico and favicon.png requests are now handled correctly

Caddyfile

@@ -37,3 +37,13 @@ stargirlnails.de {
 http://stargirlnails.de {
     redir https://stargirlnails.de{uri} permanent
 }
+
+# Favicon-Konfiguration
+favicon.ico {
+    redir /favicon.png 301
+}
+
+favicon.png {
+    root * /app/dist
+    file favicon.png
+}