chore: Update flake.nix and docman package configuration

- Modified the `flake.nix` file
- Updated the version, build, vendorSha256, ldflags, buildInputs, and meta attributes of the `docman` package
- Made changes to the `devShells` variable

flake.nix

@@ -28,7 +28,8 @@
       packages = forAllSystems (system:
         let
           pkgs = nixpkgsFor.${system};
-          
+        
+          version = import versionTool { inherit pkgs; };
           versionToolPackage = versionTool.defaultPackage.${system};
           
         versionAndBuild = pkgs.runCommand "get-version-and-build" {
@@ -38,9 +39,11 @@
             ${versionToolPackage}/bin/version build > $out/build
         '';
         
-        version = builtins.trace (builtins.readFile "${versionAndBuild}/version") "Reading version";
-        build = builtins.trace (builtins.readFile "${versionAndBuild}/build") "Reading build";
-          
+        #version = builtins.trace (builtins.readFile "${versionToolPackage}/version") "Reading version";
+        
+#        version = builtins.trace (builtins.readFile "${versionToolPackage}/version") "Reading version";
+#        build = builtins.trace (builtins.readFile "${versionToolPackage}/build") "Reading build";
+#