docs/install: drop autotools references
19.3 will be the 3rd release without autotools, people know it's gone by now.
/cc @dbaker
GitLab will be down for maintenance Monday June 03, from approx 10am UTC for roughly 48 hours. This is for a major gitlab upgrade which requires a DB migration. See the tracker issue for more informations.
19.3 will be the 3rd release without autotools, people know it's gone by now.
/cc @dbaker