get back home.html.erb
讓主頁面的 Create, Delate 功能用 Ajax 呈現

delete:
add div_for @ _page_item.html.erb
add destroy.js.erb
destroy action 調整
pages_helper 調整

new:
修改 new.html.erb 放入到 index.html裡面
修改 css 符合版面配置

create:
add create.js.erb