Split up Sidekiq work across more specific queues. #422

[Split up Sidekiq work across more specific queues. #422](https://assembly.com/coderwall/bounties/422)
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New sidekiq queues & priorities:
* event_tracker - 5
* index - 4
* timeline -  3
* user - 2
* data_cleanup - 1
* event_publisher - 1
* github - 1
* mailer - 1
* network - 1
* protip - 1
* team - 1

:information_source: A 2nd PR that removes the old queues from sidekiq.yml will need to be created after this is deployed to production. Jobs queued up during the deploy still need to be worked, that is why the OLD queues are not removed by this PR.  Once the OLD queues are worked & emptied, then the 2nd PR can merged and deployed :information_source: