remove flake lock and precommit hooks

.gitignore

@@ -1,5 +1,6 @@
 result
 .stfolder
+flake.lock
 
 # direnv
 .direnv

.pre-commit-config.yaml

@@ -3,9 +3,9 @@
 repos:
 - repo: local
   hooks:
-  - id: update-flake-lock
-    name: Update Flake Lock
-    entry: nix flake update --flake .
+  - id: nix-eval-build-targets
+    name: evaluate NixOS build targets
+    entry: bash util/pre_commit_nix_eval.sh
     language: system
     always_run: true
     pass_filenames: false
@@ -17,4 +17,3 @@ repos:
     always_run: true
     pass_filenames: false
     stages: [pre-push]
-