remix

Add an example to load file from a directory along with https://remix-ide.readthedocs.io/en/latest/locations.html#load-one-of-the-default-remix-files

Describe the bug

Currently there is no easy way to throw errors inside loaders/actions. We should probably come up with an easy to use solution.

I have something like the following in my head:

<script context="module" ssr>
  import {  NotFoundError, HttpError } from "svemix/errors"
  export const loader = () => {
    throw new NotFoundError("User not found").
    throw n

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