Tidy up PhameBlogManage

Summary: Remove unneeded actions, fix archive controller, adds some icons. Ref T9897

Test Plan: Archive a blog, unarchive a blog

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Maniphest Tasks: T9897

Differential Revision: https://secure.phabricator.com/D14709