Custom 404 Not Found page

[Merseleo]

Problem

At the moment we do not really load data from the backend, but hardcoded all objects in the load functions. As soon as we start to really load data, something could go wrong, especially that the resource cannot be found.

Suggested Solution

Therefore you can throw an error using error(404, { message: "your message" }) which causes svelte to render a custom +error.svelte file.
However, this file is very basic at the moment and need a redesign.
It should have a design matching the general snowballr design and a speaking error message.