made the index webpage into two parts

added register/login links when not logged in
when logged in, chat and profile links are shown

js/index.js

@@ -0,0 +1,8 @@
+window.addEventListener("load",async function(){
+  let data = await(await fetch("/api/getuser")).json()
+  if(data["username"] != undefined) {
+    document.getElementById("HasAccount").style=""
+  } else {
+    document.getElementById("NoAccount").style=""
+  }
+})