Begin add PostList routes + 404

src/app/pages/posts.rs

@@ -0,0 +1,13 @@
+use leptos::*;
+use leptos_router::*;
+
+#[component]
+pub fn PostList(
+    folder: String
+) -> impl IntoView {
+    view! {
+        <main class="m-0 p-0 bg-surface dark:bg-dark_surface text-on_surface dark:text-dark_on_surface">
+            Page List
+        </main>
+    }
+}