arch-boot-opt: fix mirror url

gitlab-ci: update submodule

posts: add arch-boot-opt

add submodule: arch-linux-boot-optimize

main: cleanup

main: fix horiz scrollbar, tweak color

main: use custom scrollbar

gitlab-pages-without-domain: fix <>

posts: add gitlab-pages-without-domain

Delete screenshot.png

Delete screenshot-layouts.png

archive__item-title: remove 'a' underline

variables: noto sans tc: use light

variables: add noto sans tc

gitlab-ci: rougify: switch to base16.dark

gitlab-ci: rougify: append to main.scss

gitlab-ci: fix seq

gitlab-ci: make rouge style

posts: add docker-in-lxc

posts: add sendmail