- Replace Font Awesome by Bootstrap Icons.
- Add support for MyST Markdown. Add new dependency on `pelican-myst-reader`.
- Remove support for `pymdownx` and dependency on `pymdown-extensions`.
- Remove direct dependency on `Markdown`, `pygments`.
- Auto-detect location of `closure.jar` file for `webassets`.
- Move `bump-my-version` configuration to `pyproject.toml`.
- Remove `bump2version` from dev dependencies, and let the external workflows install it.