roles/aurweb: Change URL to point to gitlab

Change the URL's of the aurweb project and the tu-bylaws project to point to
gitlab instead of git.archlinux.org.

roles/aurweb/defaults/main.yml

 ---
 
 aurweb_domain: 'aur.archlinux.org'
-aurweb_repository: 'https://git.archlinux.org/aurweb.git'
-tubylaws_repository: 'https://git.archlinux.org/tu-bylaws.git'
+aurweb_repository: 'https://gitlab.archlinux.org/archlinux/aurweb.git'
+tubylaws_repository: 'https://gitlab.archlinux.org/archlinux/tu-bylaws.git'
 aurweb_dir: '/srv/http/aurweb'
 aurweb_conf_dir: '/etc/aurweb'
 aurweb_git_dir: "{{ aurweb_dir }}/aur.git"