Use flake in .envrc

.envrc

@@ -1,11 +1 @@
-#! /bin/sh
-
-# reload when these files change
-watch_file flake.nix
-watch_file flake.lock
-
-{
-  # shell gc root dir
-  mkdir -p "$(direnv_layout_dir)"
-  eval "$(nix print-dev-env --profile $(direnv_layout_dir)/flake-profile)"
-}
+use flake