doc/packages: add treefmt section

doc/packages/index.md

@@ -25,6 +25,7 @@ nginx.section.md
 opengl.section.md
 shell-helpers.section.md
 python-tree-sitter.section.md
+treefmt.section.md
 steam.section.md
 cataclysm-dda.section.md
 urxvt.section.md

doc/packages/treefmt.section.md

@@ -0,0 +1,8 @@
+# treefmt {#treefmt}
+
+[treefmt](https://github.com/numtide/treefmt) streamlines the process of applying formatters to your project, making it a breeze with just one command line.
+
+The [`treefmt` package](https://search.nixos.org/packages?channel=unstable&show=treefmt)
+provides functions for configuring treefmt using the module system.
+
+Alternatively, treefmt can be configured using [treefmt-nix](https://github.com/numtide/treefmt-nix).

doc/redirects.json

@@ -483,6 +483,9 @@
   "tester-testEqualArrayOrMap-return": [
     "index.html#tester-testEqualArrayOrMap-return"
   ],
+  "treefmt": [
+    "index.html#treefmt"
+  ],
   "typst": [
     "index.html#typst",
     "doc/languages-frameworks/typst.section.md#typst"