feat: user preferences (#470)

* wip: improve user preferences

* wip: fix translations and add user danger zone

* feat: add user delete button to danger zone

* fix: test not working

* refactor: add access checks for user edit page, improve not found behaviour, change user preference link in avatar menu to correct link

* fix: remove invalid bg for container

* chore: address pull request feedback

apps/nextjs/src/app/[locale]/manage/[...not-found]/page.tsx

@@ -1,17 +1,5 @@
-import { Center, Stack, Text, Title } from "@mantine/core";
+import { notFound } from "next/navigation";
 
-import { getScopedI18n } from "@homarr/translation/server";
-
-export default async function NotFound() {
-  const t = await getScopedI18n("management.notFound");
-  return (
-    <Center h="100%">
-      <Stack align="center">
-        <Title order={1} tt="uppercase">
-          {t("title")}
-        </Title>
-        <Text>{t("text")}</Text>
-      </Stack>
-    </Center>
-  );
+export default function NotFound() {
+  return notFound();
 }