Ability to add, edit, and delete camera groups in the UI

[NickM-27]

Frontend changes:

• adds + button on desktop so that camera groups can be edited
• camera group consists of a name, icon, and 2+ cameras
• when a user makes any changes to camera groups these changes are immediately reflected without frigate needing to restart
• fix bug where double clicking home button navigates to previous page

Backend changes:

• yaml updater now supports lists
• yaml updater now sets appropriate indentation when saving yaml file
• yaml update api accepts a json arg which can be used to update the config in place without restarting frigate

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