Configure pre-commit hooks

- run "fix-branch-references" before every commit
- add common pre-commit hooks from the pre-commit framework

.pre-commit-config.yaml

@@ -0,0 +1,22 @@
+default_stages: [commit]
+fail_fast: true
+repos:
+- repo: local
+  hooks:
+  - id: fix-branch-references
+    name: Check for wrong branch references
+    entry: poetry run nox -s fix-branch-references --
+    language: system
+    stages: [commit, merge-commit]
+    types: [text]
+# Enable hooks provided by the pre-commit project to
+# enforce rules that local tools could not that easily.
+- repo: https://github.com/pre-commit/pre-commit-hooks
+  rev: v3.2.0
+  hooks:
+  - id: check-added-large-files
+    args: [--maxkb=250]
+  - id: check-merge-conflict
+  - id: no-commit-to-branch
+    args: [--branch, main]
+  - id: trailing-whitespace