[Meta] Make sure install process is great

Build & Packaging

• GitLab installation should be well documented and quick (#2432)
• Finalize Helm chart naming and architecture (https://gitlab.com/charts/charts.gitlab.io/issues/15)
• Submit PR to deprecate stable Charts (#2462 (closed))

Documentation & Website

• Improve Docker container instructions (https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/13749)
• Update our AWS instruction page (gitlab-com/www-gitlab-com#1381 (closed))
• Update our Update page (gitlab-com/www-gitlab-com#1454 (closed))
• Move Azure blog post to be part of documentation (https://gitlab.com/gitlab-org/gitlab-ce/issues/36116)
• Move OpenShift blog post to be part of documentation (https://gitlab.com/gitlab-org/gitlab-ce/issues/32388)
• Add GCP marketplace images to /installation (gitlab-com/www-gitlab-com#1326 (closed))
• Redirect /downloads pages to /installation (gitlab-com/www-gitlab-com#1449 (closed))