Add docsga

docs/default.nix

@@ -0,0 +1,17 @@
+{ pkgs, build_systems, ... }:
+
+let
+  makeOptionsDoc = configuration: pkgs.nixosOptionsDoc { inherit (configuration) options lib; };
+  example = makeOptionsDoc (build_systems [ "example" ] ../example/.)."example";
+in
+pkgs.stdenvNoCC.mkDerivation {
+  name = "dashNix-book";
+  src = ./.;
+
+  patchPhase = ''
+    sed '/*Declared by:*/,/^$/d' <${example.optionsCommonMark} >> src/dashNix.md
+  '';
+  buildPhase = ''
+    ${pkgs.mdbook}/bin/mdbook build --dest-dir $out
+  '';
+}

docs/src/dashNix.md

@@ -0,0 +1 @@
+pingpang