🥅 Add 404 to catch errors

Reduce the ammount of visible errors by adding a 404 page.

src/pages/404.tsx

@@ -0,0 +1,95 @@
+import React from 'react';
+import {
+  createStyles,
+  Container,
+  Title,
+  Text,
+  Button,
+  Group,
+  useMantineTheme,
+} from '@mantine/core';
+import { NextLink } from '@mantine/next';
+
+const useStyles = createStyles((theme) => ({
+  root: {
+    paddingTop: 80,
+    paddingBottom: 80,
+  },
+
+  inner: {
+    position: 'relative',
+  },
+
+  image: {
+    position: 'absolute',
+    top: 0,
+    right: 0,
+    left: 0,
+    zIndex: 0,
+    opacity: 0.75,
+  },
+
+  content: {
+    paddingTop: 220,
+    position: 'relative',
+    zIndex: 1,
+
+    [theme.fn.smallerThan('sm')]: {
+      paddingTop: 120,
+    },
+  },
+
+  title: {
+    fontFamily: `Greycliff CF, ${theme.fontFamily}`,
+    textAlign: 'center',
+    fontWeight: 900,
+    fontSize: 38,
+
+    [theme.fn.smallerThan('sm')]: {
+      fontSize: 32,
+    },
+  },
+
+  description: {
+    maxWidth: 540,
+    margin: 'auto',
+    marginTop: theme.spacing.xl,
+    marginBottom: theme.spacing.xl * 1.5,
+  },
+}));
+
+export function Illustration(props: React.ComponentPropsWithoutRef<'svg'>) {
+  const theme = useMantineTheme();
+  return (
+    <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 362 145" {...props}>
+      <path
+        fill={theme.colorScheme === 'dark' ? theme.colors.dark[6] : theme.colors.gray[0]}
+        d="M62.6 142c-2.133 0-3.2-1.067-3.2-3.2V118h-56c-2 0-3-1-3-3V92.8c0-1.333.4-2.733 1.2-4.2L58.2 4c.8-1.333 2.067-2 3.8-2h28c2 0 3 1 3 3v85.4h11.2c.933 0 1.733.333 2.4 1 .667.533 1 1.267 1 2.2v21.2c0 .933-.333 1.733-1 2.4-.667.533-1.467.8-2.4.8H93v20.8c0 2.133-1.067 3.2-3.2 3.2H62.6zM33 90.4h26.4V51.2L33 90.4zM181.67 144.6c-7.333 0-14.333-1.333-21-4-6.666-2.667-12.866-6.733-18.6-12.2-5.733-5.467-10.266-13-13.6-22.6-3.333-9.6-5-20.667-5-33.2 0-12.533 1.667-23.6 5-33.2 3.334-9.6 7.867-17.133 13.6-22.6 5.734-5.467 11.934-9.533 18.6-12.2 6.667-2.8 13.667-4.2 21-4.2 7.467 0 14.534 1.4 21.2 4.2 6.667 2.667 12.8 6.733 18.4 12.2 5.734 5.467 10.267 13 13.6 22.6 3.334 9.6 5 20.667 5 33.2 0 12.533-1.666 23.6-5 33.2-3.333 9.6-7.866 17.133-13.6 22.6-5.6 5.467-11.733 9.533-18.4 12.2-6.666 2.667-13.733 4-21.2 4zm0-31c9.067 0 15.6-3.733 19.6-11.2 4.134-7.6 6.2-17.533 6.2-29.8s-2.066-22.2-6.2-29.8c-4.133-7.6-10.666-11.4-19.6-11.4-8.933 0-15.466 3.8-19.6 11.4-4 7.6-6 17.533-6 29.8s2 22.2 6 29.8c4.134 7.467 10.667 11.2 19.6 11.2zM316.116 142c-2.134 0-3.2-1.067-3.2-3.2V118h-56c-2 0-3-1-3-3V92.8c0-1.333.4-2.733 1.2-4.2l56.6-84.6c.8-1.333 2.066-2 3.8-2h28c2 0 3 1 3 3v85.4h11.2c.933 0 1.733.333 2.4 1 .666.533 1 1.267 1 2.2v21.2c0 .933-.334 1.733-1 2.4-.667.533-1.467.8-2.4.8h-11.2v20.8c0 2.133-1.067 3.2-3.2 3.2h-27.2zm-29.6-51.6h26.4V51.2l-26.4 39.2z"
+      />
+    </svg>
+  );
+}
+
+export default function NothingFoundBackground() {
+  const { classes } = useStyles();
+
+  return (
+    <Container className={classes.root}>
+      <div className={classes.inner}>
+        <Illustration className={classes.image} />
+        <div className={classes.content}>
+          <Title className={classes.title}>Nothing to see here</Title>
+          <Text color="dimmed" size="lg" align="center" className={classes.description}>
+            Page you are trying to open does not exist. You may have mistyped the address, or the
+            page has been moved to another URL. If you think this is an error contact support.
+          </Text>
+          <Group position="center">
+            <NextLink href="/">
+              <Button size="md">Take me back to home page</Button>
+            </NextLink>
+          </Group>
+        </div>
+      </div>
+    </Container>
+  );
+}