Removed nvimcom

It seems to work best when installed directly from nvim with R.nvim
loaded. The package asks to install it when it is not present.

I set a local `.Rlibs` folder to install into via the `R_LIBS_USER`
environment variable. This needs to be deleted when R is updated or
leads to a segfault when using nix due to wrong permissions.

flake.nix

@@ -90,8 +90,6 @@
           src = fetchfromGitHubJSONFile ./versions/musicMetadata.json;
         };
 
-        ## N
-
         ## S
         summclust = prev.rPackages.buildRPackage {
           name = "summclust";
@@ -154,11 +152,6 @@
             franUpdate
           ];
         };
-        newPkg = pkgs.mkShell {
-          packages = with self.packages."${system}"; [
-            franUpdate
-          ];
-        };
       }
     );
   };