feat: custom branding (#112)

* add first concept

* remove setup status

* split config page in multiple components

* add custom branding docs

* add test email button

* fix invalid email from header

* add migration

* mount images to host

* update docs

* remove unused endpoint

* run formatter

frontend/src/components/admin/configuration/ConfigurationHeader.tsx

@@ -0,0 +1,54 @@
+import {
+  Burger,
+  Button,
+  Group,
+  Header,
+  MediaQuery,
+  Text,
+  useMantineTheme,
+} from "@mantine/core";
+import Link from "next/link";
+import { Dispatch, SetStateAction } from "react";
+import useConfig from "../../../hooks/config.hook";
+import Logo from "../../Logo";
+
+const ConfigurationHeader = ({
+  isMobileNavBarOpened,
+  setIsMobileNavBarOpened,
+}: {
+  isMobileNavBarOpened: boolean;
+  setIsMobileNavBarOpened: Dispatch<SetStateAction<boolean>>;
+}) => {
+  const config = useConfig();
+  const theme = useMantineTheme();
+  return (
+    <Header height={60} p="md">
+      <div style={{ display: "flex", alignItems: "center", height: "100%" }}>
+        <MediaQuery largerThan="sm" styles={{ display: "none" }}>
+          <Burger
+            opened={isMobileNavBarOpened}
+            onClick={() => setIsMobileNavBarOpened((o) => !o)}
+            size="sm"
+            color={theme.colors.gray[6]}
+            mr="xl"
+          />
+        </MediaQuery>
+        <Group position="apart" w="100%">
+          <Link href="/" passHref>
+            <Group>
+              <Logo height={35} width={35} />
+              <Text weight={600}>{config.get("general.appName")}</Text>
+            </Group>
+          </Link>
+          <MediaQuery smallerThan="sm" styles={{ display: "none" }}>
+            <Button variant="light" component={Link} href="/admin">
+              Go back
+            </Button>
+          </MediaQuery>
+        </Group>
+      </div>
+    </Header>
+  );
+};
+
+export default ConfigurationHeader;