because it's going to be a blog, really.

because it was the same in tagsort and other pages.

tested that sed cmd, and it was not perfect, so i polished it a bit.

also add post excerpt functionality.

oops, i thought it'll work

edit post layout to handle tags, add sort-by-tag page and edit
stylesheet according post content updates

this is not for real like blog posts, but for my telegram ones. they are
small and may be just written in plain on one page. of course, it'll
make this page too long, but to that time i'll find how to deal with it.

remove .html from url

they are filled with temporary stuff, but this is the work for future.