Revert "fix: `querySelectorAll` ignores class of root"

This reverts commit 841aa1c38be151c711bf93fe7ea7b10d20265a3e.
fix: kisume boot, at last
fix core: cope with renren &nbsp; filter
`markdown.css` should refer to "trunk" github image
postproc/gist: minor cosmetic
process: remove dup'd `inlineCss`