refactor: Remove unused code and update dependencies

frontend/index.html

@@ -12,7 +12,6 @@
 
     <script src="js/vue3-sfc-loader.js"></script>
     <script src="js/login-canvas.js"></script>
-    <script src="simplemde/simplemde.js"></script>
     <style>
         #loading-placeholder {
             position: fixed;