Remove main.py, add pre-commit configuration, update .vscode settings, and modify README

.pre-commit-config.yaml

@@ -0,0 +1,45 @@
+repos:
+  - repo: https://github.com/asottile/add-trailing-comma
+    rev: v4.0.0
+    hooks:
+      - id: add-trailing-comma
+
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v6.0.0
+    hooks:
+      - id: check-ast
+      - id: check-builtin-literals
+      - id: check-docstring-first
+      - id: check-executables-have-shebangs
+      - id: check-merge-conflict
+      - id: check-toml
+      - id: check-vcs-permalinks
+      - id: end-of-file-fixer
+      - id: mixed-line-ending
+      - id: name-tests-test
+        args: [--pytest-test-first]
+      - id: trailing-whitespace
+
+  - repo: https://github.com/adamchainz/django-upgrade
+    rev: 1.30.0
+    hooks:
+      - id: django-upgrade
+        args: [--target-version, "6.0"]
+
+  - repo: https://github.com/astral-sh/ruff-pre-commit
+    rev: v0.15.10
+    hooks:
+      - id: ruff-check
+        args: ["--fix", "--exit-non-zero-on-fix"]
+      - id: ruff-format
+
+  - repo: https://github.com/asottile/pyupgrade
+    rev: v3.21.2
+    hooks:
+      - id: pyupgrade
+        args: ["--py313-plus"]
+
+  - repo: https://github.com/rhysd/actionlint
+    rev: v1.7.12
+    hooks:
+      - id: actionlint