fix: Sponsor and About Working Groups nav links

config.toml

@@ -187,7 +187,7 @@ disablePathToLower = true
 
 [[menu.main]]
   name = "Sponsor"
-  url = "/sponsor/collaboration"
+  url = "/sponsor/"
   weight = 1
   parent = "supporters-sponsorship"
 
@@ -235,7 +235,7 @@ disablePathToLower = true
 
 [[menu.main]]
   name = "About Working Groups"
-  url = "/org/workinggroups/"
+  url = "/org/workinggroups/about.php"
   weight = 3
   parent = "collaborations-industry-collaborations"