Move pre-commit to dev dependencies and revert .gitignore changes

Co-authored-by: mingrammer <6178510+mingrammer@users.noreply.github.com>

.gitignore

@@ -11,14 +11,6 @@ __pycache__/
 # graphviz
 *.gv*
 
-# test outputs
-diagram-*
-diagrams_image
-example_*
-my_custom_name
-test_diagram.py
-test_resources_render
-
 # dist
 dist
 website/build

pyproject.toml

@@ -30,6 +30,7 @@ dev = [
     "rope~=1.13",
     "isort~=6.0",
     "black~=24.4",
+    "pre-commit~=4.0",
 ]
 
 [tool.hatch.build]