Use pre-commit CI in favor of GitHub action

[codingjoe]

No description provided.

[Copilot]

Pull Request Overview

This PR modernizes the project's linting and formatting infrastructure by migrating from a local lint setup to pre-commit CI, consolidating configuration, and applying formatting standards across documentation and code files.

• Removes standalone lint job from CI workflow and optional lint dependencies from pyproject.toml
• Migrates from local pre-commit hooks to standardized remote hooks with added formatters (mdformat, yamlfmt, pyupgrade, django-upgrade)
• Applies formatting changes to documentation (CODE_OF_CONDUCT.md), configuration files (README.md, settings.py, YAML workflows), and removes deprecated setup.cfg

Reviewed Changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
pyproject.toml	Removes optional lint dependencies (black, pre-commit, ruff)
setup.cfg	Deletes deprecated flake8 configuration file
.pre-commit-config.yaml	Replaces local hooks with remote pre-commit hooks, adds new formatters, and configures pre-commit CI
.github/workflows/ci.yml	Removes standalone lint job and reformats YAML structure
.github/workflows/release.yml	Reformats YAML structure for consistency
tests/testapp/settings.py	Simplifies SECRET_KEY assignment to single line
README.md	Changes string quotes from single to double
CODE_OF_CONDUCT.md	Converts bullet points from * to - and repositions homepage reference

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[amureki]

Love it!