Update the nginx config to use a single well-known location block.

docker/server/nginx.conf

@@ -45,10 +45,7 @@ http {
 
         location /.well-known/ {
             alias /srv/http/public/well-known/;
-            default_type text/plain;
-        }
-
-        location ~ /\.well-known/openpgpkey/[^/]+/hu/ {
+            # default_type text/plain;
             default_type        "application/octet-stream";
             add_header          Access-Control-Allow-Origin * always;
         }