refactor(article-viewer): extract common drawer viewers (#1112)

* fix(drawer): close ux & model blur issue

* refactor(Drawer): add on enhance

* refactor(Drawer): adjust styles

* refactor(drawer): wip

* refactor(drawer): add fixedHeader for article

* refactor(drawer): improve fixedHeader function

* refactor(comment): use common IconButton

* refactor(postItem): use common IconButton

* style(avatar): adjust color

* refactor(upvote): PromoteList naming & upvote comment style

* refactor(comment): remove old Upvote

* refactor(ArticleViewer): seperate PostViewer

* refactor(ArticleViewer): a works demo viewer

Author: mydearxym