feature/fix-deck-rename

This PR fixes an issue with the deck rename functionality. The issue is that when you edit the deck name as an instructor, the navigation still shows the old deck name until/unless the page is refreshed. As a result of these changes, the navigation will be updated automatically when the deck is renamed.

@jazahn Can you review this?

---
[FLASH-147](https://jira.huit.harvard.edu/browse/FLASH-147)