docs: remove envrc config

ryoppippi · ryoppippi · commit 1575b9a1ab8a · 2025-12-23T10:34:40.000Z
diff --git a/README.md b/README.md
@@ -606,8 +606,6 @@ This project includes a Nix flake for reproducible development environments. If
 # Enter development shell
 nix develop
 
-# Or use direnv for automatic activation
-echo "use flake" > .envrc
 direnv allow
 ```
 
