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* Remove migration support from versions earlier than 1.6.0 * Remove unused functions * Update gogs upgrade instructions * Improve "latest" link as per @jolheiser Co-authored-by: Antoine GIRARD <sapk@users.noreply.github.com> Co-authored-by: Lauris BH <lauris@nix.lv> Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>