Consolidate reviewers and assignees in templates
.gitlab/issue_templates/*: Remove pierre from list of main keys.
.gitlab/merge_request_templates/*: Use group of main key holders when assigning reviewers, instead of listing them all separately.
Due to an influx of spam, we have had to temporarily disable account registrations. Please write an email to accountsupport@archlinux.org, with your desired username, if you want to get access. Sorry for the inconvenience.
.gitlab/issue_templates/*: Remove pierre from list of main keys.
.gitlab/merge_request_templates/*: Use group of main key holders when assigning reviewers, instead of listing them all separately.