Merge branch 'docs/optimize-images' into 'master'
Reduce size of images in docs from 25MB to 13MB using pngquant - Previous MR that used zopflipng https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/4325 - Similar MR to another repo https://gitlab.com/gitlab-com/www-gitlab-com/merge_requests/3232 See merge request !7679
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