Upgrade header design
Upgrade footer design
Upgrade post/index view design
Upgrade posts/new, edit, _form views design
Upgrade posts/show view design
Modify footer design
Modify syntax highlight code
Upgrade posts/show view design
不要な記述削除
Hide about page link
Modify footer copyrights
Hide sidemenu
Merge pull request #16 from ahkr/update_design

Update design