Reduce size of images in docs from 25MB to 13MB using pngquant (!7679) · Merge requests · GitLab.org / GitLab FOSS · GitLab

Previous MR that used zopflipng https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/4325
Similar MR to another repo gitlab-com/www-gitlab-com!3232 (closed)