add 404 page

src/components/PageNotFound.vue

@@ -0,0 +1,17 @@
+<template>
+    <div class="flex flex-col justify-center items-center min-h-[88vh]">
+        <h1 class="font-bold">404</h1>
+        <h2 v-t="'info.page_not_found'" />
+        <a class="btn mt-16" href="/" v-t="'actions.back_to_home'" />
+    </div>
+</template>
+
+<style scoped>
+/* font size can't be handled within windiCSS classes because it's overwritten with !important */
+h1 {
+    font-size: 8rem !important;
+}
+h2 {
+    font-size: 1.7rem !important;
+}
+</style>