fix: remove redundant defer attribute in main.js script element

Author: Rex-82

client/index.html

@@ -10,7 +10,7 @@
       data-domain="chat.rilae.com"
       src="https://plausible.rilae.com/js/script.js"
     ></script>
-    <script defer type="module" src="./src/main.js"></script>
+    <script type="module" src="./src/main.js"></script>
     <link
       rel="stylesheet"
       href="https://cdn.jsdelivr.net/npm/@picocss/pico@2/css/pico.slate.min.css"