nickel: migrate to by-name

pkgs/by-name/ni/nickel/package.nix

@@ -11,7 +11,7 @@ rustPlatform.buildRustPackage rec {
 
   src = fetchFromGitHub {
     owner = "tweag";
-    repo = pname;
+    repo = "nickel";
     rev = "refs/tags/${version}";
     hash = "sha256-g7pRTwa2sniIOmgdYCxfYxGRtxnQP8zaVWuPjzEZTSg=";
   };

pkgs/top-level/all-packages.nix

@@ -11362,8 +11362,6 @@ with pkgs;
 
   npapi_sdk = callPackage ../development/libraries/npapi-sdk { };
 
-  nickel = callPackage ../development/interpreters/nickel { };
-
   npiet = callPackage ../development/interpreters/npiet { };
 
   npth = callPackage ../development/libraries/npth { };