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

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

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

@@ -19,6 +19,7 @@ import {
   TbBucket,
   TbBinaryTree,
   TbSettings,
+  TbScale,
 } from "react-icons/tb";
 import { FormattedMessage } from "react-intl";
 
@@ -30,6 +31,7 @@ const categories = [
   { name: "OAuth", icon: <TbSocial /> },
   { name: "LDAP", icon: <TbBinaryTree /> },
   { name: "S3", icon: <TbBucket /> },
+  { name: "Legal", icon: <TbScale /> },
 ];
 
 const useStyles = createStyles((theme) => ({