remove pre-commit install from nix dev shell (#2461) (#2471)

## Checklist

- [ ] I have added
[tests](https://www.cursorless.org/docs/contributing/test-case-recorder/)
- [ ] I have updated the
[docs](https://github.com/cursorless-dev/cursorless/tree/main/docs) and
[cheatsheet](https://github.com/cursorless-dev/cursorless/tree/main/cursorless-talon/src/cheatsheet)
- [ ] I have not broken the cheatsheet

Author: fidgetingbits

flake.nix

@@ -44,7 +44,7 @@
             buildInputs = [ pkgs.bashInteractive ];
             shellHook = ''
               if [ ! -f .git/hooks/pre-commit ]; then
-                pre-commit install
+                echo "You can run 'pre-commit install' to install git commit hooks if you want them."
               fi
 
               pnpm install