nixos/profiles/perlless: add release-note

nixos/doc/manual/release-notes/rl-2405.section.md

@@ -24,6 +24,16 @@ In addition to numerous new and upgraded packages, this release has the followin
 - A new option `system.etc.overlay.enable` was added. If enabled, `/etc` is
   mounted via an overlayfs instead of being created by a custom perl script.
 
+- It is now possible to have a completely perlless system (i.e. a system
+  without perl). Previously, the NixOS activation depended on two perl scripts
+  which can now be replaced via an opt-in mechanism. To make your system
+  perlless, you can use the new perlless profile:
+  ```
+  { modulesPath, ... }: {
+    imports = [ "${modulesPath}/profiles/perlless.nix" ];
+  }
+  ```
+
 ## New Services {#sec-release-24.05-new-services}
 
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