move auth pages into auth dir

pages/auth/signout.vue

@@ -43,5 +43,5 @@ user.value = null;
 
 // Redirect to signin page after signout
 await $dropFetch("/signout");
-router.push("/signin");
+router.push("/auth/signin");
 </script>

pages/register.vue

@@ -248,7 +248,7 @@ function register_wrapper() {
   loading.value = true;
   register()
     .then(() => {
-      router.push("/signin");
+      router.push("/auth/signin");
     })
     .catch((response) => {
       const message = response.statusMessage || "An unknown error occurred";