Fix broken link

Signed-off-by: Nick Slowinski <nick@nick-slowinski.de>

docusaurus.config.ts

@@ -112,7 +112,7 @@ const config: Config = {
             },
             {
               label: 'nsAccounts (Kontoverwaltung)',
-              to: 'accounts.nick-slowinski.de/realms/nick-slowinski_de/account',
+              to: 'https://accounts.nick-slowinski.de/realms/nick-slowinski_de/account',
             },
             {
               label: 'TeamSpeak',