feat: add legal page with configuration options (#724)

* Addconfig entries for legal notice

* Add legal route handling to middleware

* Make legal notice public

* Add legal category to config sidebar

* Add legal notice page

* Add German translations for legal notice and configuration options

* Replace legal page with separate imprint and privacy pages

* Update middleware

* Add footer component

* Update legal text descriptions to indicate Markdown support again

* Refactor footer layout

* Add zIndex to footer component

* improve mobile layout

* run formatter

---------

Co-authored-by: Elias Schneider <login@eliasschneider.com>

frontend/src/pages/_app.tsx

@@ -3,6 +3,7 @@ import {
   ColorSchemeProvider,
   Container,
   MantineProvider,
+  Stack,
 } from "@mantine/core";
 import { useColorScheme } from "@mantine/hooks";
 import { ModalsProvider } from "@mantine/modals";
@@ -30,6 +31,7 @@ import Config from "../types/config.type";
 import { CurrentUser } from "../types/user.type";
 import i18nUtil from "../utils/i18n.util";
 import userPreferences from "../utils/userPreferences.util";
+import Footer from "../components/footer/Footer";
 
 const excludeDefaultLayoutRoutes = ["/admin/config/[category]"];
 
@@ -134,10 +136,18 @@ function App({ Component, pageProps }: AppProps) {
                     <Component {...pageProps} />
                   ) : (
                     <>
-                      <Header />
-                      <Container>
-                        <Component {...pageProps} />
-                      </Container>
+                      <Stack
+                        justify="space-between"
+                        sx={{ minHeight: "100vh" }}
+                      >
+                        <div>
+                          <Header />
+                          <Container>
+                            <Component {...pageProps} />
+                          </Container>
+                        </div>
+                        <Footer />
+                      </Stack>
                     </>
                   )}
                 </UserContext.Provider>