docs: move ndg options into ndg.toml

docs/manual.nix

@@ -31,13 +31,10 @@ in
 
     # Generate the final manual from a set of parameters. This uses
     # feel-co/ndg to render the web manual.
-    ndg html \
+    ndg --config-file ${./ndg.toml} html \
       --jobs $NIX_BUILD_CORES --title "NVF" \
       --module-options ${optionsJSON}/share/doc/nixos/options.json \
       --manpage-urls ${path}/doc/manpage-urls.json \
-      --options-depth 3 \
-      --generate-search \
-      --highlight-code \
       --input-dir ./manual \
       --output-dir "$out/share/doc"
 

docs/ndg.toml

@@ -0,0 +1,28 @@
+# NDG Configuration File
+
+# Input directory containing markdown files
+input_dir = "docs"
+
+# Output directory for generated documentation
+output_dir = "build"
+
+# Title for the documentation
+title = "NVF"
+
+# Footer text for the documentation
+footer_text = "Generated with ndg"
+
+generate_anchors = true
+
+# Search configuration
+[search]
+enable = true
+highlight_code = true
+tab_style = "none"
+revision = "main"
+
+# Maximum heading level to index
+max_heading_level = 3
+
+# Depth of parent categories in options TOC
+options_toc_depth = 2