fix: gateway oidc rewrite and abstract rules

gateway/nginx.conf

@@ -56,6 +56,7 @@ server {
 
     # Hydra Public API
     location /oidc {
+        rewrite ^/oidc/(.*)$ /$1 break;
         proxy_pass $oathkeeper_upstream;
         proxy_set_header Host $host;
         proxy_set_header X-Real-IP $remote_addr;