* This commit adds the "archived" attribute to the Article model, which will
enable users to automatically filter archived articles/drafts from appearing
on their dashboard. It also adds an ellipsis menu with a link to archive the
article. I've also moved the Mute Notifications button into the ellipsis menu
as well.
* Add ellipsis menu and make it work
* Fix logic error
* Hide ellipsis menus when you click elsewhere on the body
* Extract function to remove duplication
* Ensure that menu is hidden when the ellipsis button is clicked on an open menu
* Ensure that archiving post button works and that 'archived' param is accepted by the controller
* Enable link to toggle showing/hiding archived articles
* Make 'mute' and 'archive' buttons in ellipsis dropdown list work
* Refactor to make Code Climate happy
* Minor JS refactors
