Django-icons

- Switch to Hatch for builds and environments (403).
- Improve and fix CI on GitHub Actions (403).
- Reinstate coveralls (403).
- Update Sphinx and switch to Furo theme (403).

- Add changelog to documentation (358).
- Fix documentation (355).
- Use production version of Django in tox (357).
- Fix README.md (373).
- Update packaging, reduce dependencies (356, 368, 374).
- Drop support for Django 4.0 (374).
- Fix example app (377).
- Update example app (379).
- Add support for nested icons and content in icon definitions (378).
- Update documentation and examples (381).

- Update requirements, support Django 4.2, remove coveralls (352).

- Drop support for Django 2.2 (EOL) (240).
- Add support for Django 4.1 (240).

- Fix documentation issues that snuck into 21.2.

- Deprecate `icon` because of name collisions, use `render_icon` (150).
- Fix CI (148).
- Drop support for Django 3.1 (EOL) (148).
- Drop support for Python 3.6 (EOL) (148).
- Switch to stable Django 4.0 (148).