- Add new auto-generated (tasks.py) scripts and remove obsolete ones
(fabfile.py and develop_server.sh).
- Slug-related settings in 4.0+ use {slug} and/or {lang} rather than %s.
- Use Python3 instead of Python2, preparing for Pelican dropping Python
2 support.
- Follow GitLab CI docs recommendation to use stage and only.
- Select defaults on pelican-quickstart, which removes FTP, SSH, S3,
Dropbox and GitHub Pages support from Makefile. This makes sense as this
is a template for GitLab Pages.
- New "test" stage for GitLab CI which tests website generation on
branches only.