I maintain Jekyll theme for internal use (like branded sites) and this theme hould also contain favicon.ico and other icons for all browsers (generated by amazing http://realfavicongenerator.net).
The cleanest will be to include all icons in assets folder and link them from , but some is good to have in the root (some browsers preloads them by trying /favicon.ico etc., see http://realfavicongenerator.net/faq).
Is it possible to make theme to add some files to site root in build time (like it copy all files from the assets folder)?