feat(events): Add nav item for support service events

Staging endpoint for Events sub-nav under Account. Someone might complain about where it is located in the list, as the mock-up and JIRA story differ on their placement. I followed the mock-up.

https://jira.rax.io/browse/EOD-199
https://projects.invisionapp.com/d/main/default/#/console/1636425/41095075/preview