nest documentation stuff one level deeper

source/contributing/documentation/index.md

@@ -196,3 +196,11 @@ Notify the authors *before* using their work.
 [Add the original author as co-author](https://docs.github.com/en/pull-requests/committing-changes-to-your-project/creating-and-editing-commits/creating-a-commit-with-multiple-authors) to the first commit of your pull request, which should contain the original document verbatim, so we can track authorship and changes through version history.
 
 Using free licenses other than CC-BY-SA 4.0 is possible for individual documents, and by contributing changes to those documents you agree to license your work accordingly.
+
+```{toctree}
+:hidden:
+
+diataxis.md
+style-guide.md
+writing-a-tutorial.md
+```

source/contributing/how-to-contribute.md

@@ -16,7 +16,7 @@ All the source code and documentation is on [GitHub](https://github.com/NixOS),
 Technical discussions happen in issue and pull request comments.
 
 :::{tip}
-If you are new to Nix, consider [contributing documentation](./documentation.md) first.
+If you are new to Nix, consider [contributing documentation](./documentation/index.md) first.
 
 This is where we need the most help and where it is the easiest to begin.
 :::

source/contributing/index.md

@@ -7,8 +7,5 @@
 
 how-to-contribute.md
 how-to-get-help.md
-documentation.md
-diataxis.md
-style-guide.md
-writing-a-tutorial.md
+documentation/index.md
 ```