Update .gitattributes

Now the folder structure in `docs/` has changed, we have more subfolders, so that this update includes all flies regardless of the depth

.gitattributes

@@ -1,4 +1,4 @@
 # GitHub syntax highlighting
 pixi.lock linguist-language=YAML
 # Github doesn't recognize the docs folder as a documentation folder
-docs/* linguist-documentation=false
+docs/**/* linguist-documentation=false