nixos/treewide: Move rename.nix imports to their respective modules

A centralized list for these renames is not good because:
- It breaks disabledModules for modules that have a rename defined
- Adding/removing renames for a module means having to find them in the
central file
- Merge conflicts due to multiple people editing the central file

nixos/modules/programs/bash/bash.nix

@@ -40,6 +40,10 @@ let
 in
 
 {
+  imports = [
+    (mkRemovedOptionModule [ "programs" "bash" "enable" ] "")
+  ];
+
   options = {
 
     programs.bash = {