Mode for viewing emacsist.com

Quick start:

execute the following commands:
`list-emacsist' to list posts in emacsist.com
then press ~v~ to view post in eww
press ~<RET>~ or ~click down mouse-1~ to browse current post with external browser
press ~<next>~ to list posts in next-page
press ~<prior>~ to list posts in previous-page