do not install pre-commit hooks (#172)

Pre commit hooks get installed without warning when running a nix dev
shell. This has the effect of changing the development environment
outside the dev shell.

The pre-commit hooks do not take into consideration the local developers
environment or tooling, such as IDE of choice. Also, the pre-commit
hooks assume tooling which may only be present inside the dev shell.
This can lead to an inability to commit and interferes with local
development.

This patch removes that, so that running the dev shell does not change
the development environment outside the dev shell.

Author: minikin

nix/automation/devshells.nix

@@ -19,7 +19,7 @@
         PROTOC_INCLUDE = "${protobuf}/include";
       };
     nixago = [
-      cell.configs.lefthook
+      # cell.configs.lefthook
       cell.configs.prettier
       cell.configs.treefmt
     ];