chore: Refactor `flake.nix` file by removing unnecessary code and adding tracing statements

- Remove commented out `versionTool` declaration and its uses in `flake.nix`
- Add `version` tracing statement to `flake.nix`
- Add `build` tracing statement to `flake.nix`

flake.nix

@@ -50,7 +50,7 @@
 #            ${versionToolPackage}/bin/version build > $out.build
 #          '';
 #
-#          version = builtins.readFile "${versionAndBuild}.version";
+#          version = builtins.trace (builtins.readFile "${versionAndBuild}.version";
 #          build = builtins.readFile "${versionAndBuild}.build";
 
           versionAndBuild = pkgs.runCommand "get-version-and-build" {
@@ -60,6 +60,8 @@
               ${versionToolPackage}/bin/version build > $out/build
           '';           
           
+          version = builtins.trace (builtins.readFile "${versionAndBuild}.version") "Reading version";
+          build = builtins.trace (builtins.readFile "${versionAndBuild}.build") "Reading build";
           
         in
         {