Improve vertical alignment of site items and fix floating page aside#3560

zenoachtig merged 4 commits intomainGitbookIO/gitbook:mainfrom

zeno/rnd-7873-alignment-between-on-this-page-and-ask-dropdowns-isGitbookIO/gitbook:zeno/rnd-7873-alignment-between-on-this-page-and-ask-dropdowns-isCopy head branch name to clipboard