iog: remove redundant ca-references

hosts/cuallaidh.nix

@@ -11,7 +11,7 @@
     ../profiles/cryptpad.nix
     ../profiles/gitea.nix
     #../profiles/hydra.nix
-    ../profiles/iohk.nix
+    ../profiles/iog.nix
     ../profiles/ipv6.nix
     ../profiles/mastodon.nix
     ../profiles/matrix.nix

hosts/dionach.nix

@@ -13,7 +13,7 @@
     ../profiles/desktopCraige.nix # Craige's desktop tools and apps
     ../profiles/haskell-dev.nix # Haskell dev environment
     ../profiles/host_common.nix # Common host configuration options
-    ../profiles/iohk.nix # IOHK environment
+    ../profiles/iog.nix # IOHK environment
     ../profiles/keyboard.nix
     ../profiles/neomutt.nix # Neomutt email
     ../profiles/nix-community.nix # Nix community aarch64 tooling

profiles/iog.nix

@@ -27,7 +27,7 @@ in {
     ];
     extraOptions = ''
       #repeat = 1   # Ensure reproducibility of builds
-      experimental-features = nix-command flakes ca-references
+      experimental-features = nix-command flakes
     '';
   };