Docs: highlight structure vision (NixOS#342978)

Co-authored-by: Valentin Gagarin <[email protected]>

doc/README.md

@@ -2,10 +2,20 @@
 
 This directory houses the sources files for the Nixpkgs reference manual.
 
-Going forward, it should only contain [reference](https://nix.dev/contributing/documentation/diataxis#reference) documentation.
-For tutorials, guides and explanations, contribute to <https://nix.dev/> instead.
-
-For documentation only relevant for contributors, use Markdown files and code comments in the source code.
+> [!IMPORTANT]
+> We are actively restructuring our documentation to follow the [Diátaxis framework](https://diataxis.fr/)
+>
+> Going forward, this directory should **only** contain [reference documentation](https://nix.dev/contributing/documentation/diataxis#reference).
+> For tutorials, guides and explanations, contribute to <https://nix.dev/> instead.
+>
+> We are actively working to generate **all** reference documentation from the [doc-comments](https://github.com/NixOS/rfcs/blob/master/rfcs/0145-doc-strings.md) present in code.
+> This also provides the benefit of using `:doc` in the `nix repl` to view reference documentation locally on the fly.
+
+For documentation only relevant for contributors, use Markdown files next to the source and regular code comments.
+
+> [!TIP]
+> Feedback for improving support for parsing and rendering doc-comments is highly appreciated.
+> [Open an issue](https://github.com/NixOS/nixpkgs/issues/new?labels=6.topic%3A+documentation&title=Doc%3A+) to request bugfixes or new features.
 
 Rendered documentation:
 - [Unstable (from master)](https://nixos.org/manual/nixpkgs/unstable/)