Since we don't want col_focus to be on the time column as we don't
track it in recent view, we simply mark it as an element user
cannot focus to avoid any confusion.
`recent_view_focusable` class should be set on element whose
children can receive focus as per
`$topic_row.find(".recent_view_focusable").eq(col).children().trigger("focus")`
This commit removes the 'development' guard and makes
the UI changes related to the 'Follow Topics' project visible
outside the development environment.
Cleans up the older UI elements related to mute and unmute topics.