chore: Update Nixpkgs and refactor build process

- Update Nixpkgs/NixOS version
- Update `lastModifiedDate` for older versions of flakes
- Add `versionAndBuild` calculation for fetching version and build
- Remove commented out code for fetching version and build
- Update `versionToolPackage` assignment
- Remove `version` and `build` assignments after `versionAndBuild` calculation
- Update `version` and `build` assignments within `versionAndBuild` calculation
- Add output files `"version"` and `"build"` to `versionAndBuild` calculation
- Update `versionTool.defaultPackage.${system}` assignment in `buildInputs`
- Update `vendorSha256` value
- Update `ldflags` value in `docman` build phase
- Add `homepage` field to `meta` attribute for `docman`
- Update `maintainers` field in `meta` attribute for `docman`
- Update `buildInputs` field in `default` devShell

flake.nix

@@ -45,14 +45,20 @@
           # Build the versionTool for the current system.
           versionToolPackage = versionTool.defaultPackage.${system};
 
-          versionAndBuild = pkgs.runCommand "get-version-and-build" {} ''
-            ${versionToolPackage}/bin/version print --git > $out.version
-            ${versionToolPackage}/bin/version build > $out.build
-          '';
-
-          version = builtins.readFile "${versionAndBuild}.version";
-          build = builtins.readFile "${versionAndBuild}.build";
-           
+#          versionAndBuild = pkgs.runCommand "get-version-and-build" {} ''
+#            ${versionToolPackage}/bin/version print --git > $out.version
+#            ${versionToolPackage}/bin/version build > $out.build
+#          '';
+#
+#          version = builtins.readFile "${versionAndBuild}.version";
+#          build = builtins.readFile "${versionAndBuild}.build";
+
+          versionAndBuild = pkgs.runCommand "get-version-and-build" {
+              outputFiles = [ "version" "build" ];
+          } ''
+              ${versionToolPackage}/bin/version print --git > $out/version
+              ${versionToolPackage}/bin/version build > $out/build
+          '';           
           
           
         in