Remove unused stuff and the projectPath hack

flake.nix

@@ -77,18 +77,6 @@
         normalUser = attributes: attributes // {
           isNormalUser = true;
         };
-
-        # Q: Can't we just do supply a relative path "./foo" ?
-        # A: When configuring our system with flakes, Nix copies them to the
-        # Nix store to run them. So we can't use relative paths as they will refer
-        # to a file which is in the Nix store, and is immutable because it is in
-        # the Nix store, which beats the point of abusing Home Managers
-        # mkOutOfStoreSymlink to create symlinks to mutable files.
-        # To avoid this, we must give an absolute path to a file,
-        # so we do this. The @pwd@ here is replaced by the rebuild script
-        # with the working directory, then changed back after the build.
-        # And yes, this is a major hack.
-        projectPath = "@pwd@";
       } [
         configurationDirectory
         home-manager.nixosModules.home-manager