Fixed the bug where only half of the upload icon is shown
Rearranged procfile in a futile attempt to make things start in the right order
Moved import dropdown to all panes in the documentset app

Made the default view be the example doc sets when no user sets are present
changed the animations to look good when going to an upload pane directly
updated some styling
moved the example doc sets option into the menu

[finishes #59303988]
Explicitly cancel previous uploads until we have resumable upload

[finishes #58351982]
[fixes #59347070]
Added quick start video to example doc sets page

[finishes #59520276]
Fix typos
Create new MessageQueueActor that uses shared connection
Extract communication between connection and client into separate protocol object
Ignore message handler if connection has failed
Handle repeated connection failures
Stop listening for messages on connection failure
Implement apollo queue connection methods
Switch to new MessageQueueActor
Create message queue receiver with shared connection
Switch to new Message receiver
Remove old versions of message queue actors
Send correct message on connection failure
Rename classes to reflect functionality
Removed debugging Log messages
Disable multicast for discovery