doc: Port anchors preprocessor to jq script

Python is only pulled into the build closure by Mercurial, which might end up being removed.
Let’s port the script to jq, which is more likely to stay.

1 files changed, 1 insertions, 1 deletions

diff --git a/flake.nix b/flake.nix
index dd3a25e9e..536fcf9fa 100644
--- a/flake.nix
+++ b/flake.nix
@@ -102,7 +102,7 @@
             # Tests
             buildPackages.git
             buildPackages.mercurial # FIXME: remove? only needed for tests
-            buildPackages.jq
+            buildPackages.jq # Also for custom mdBook preprocessor.
           ]
           ++ lib.optionals stdenv.hostPlatform.isLinux [(buildPackages.util-linuxMinimal or buildPackages.utillinuxMinimal)];