Remove duplicated .gitignore

Author: phansch

.gitignore

@@ -19,6 +19,7 @@ Cargo.lock
 /target
 /clippy_lints/target
 /clippy_workspace_tests/target
+/clippy_dev/target
 
 # Generated by dogfood
 /target_recur/
@@ -33,6 +34,3 @@ helper.txt
 *.iml
 .vscode
 .idea
-
-# Used by the Clippy build script
-min_version.txt