Trying out changes to reduce the number of nav items in the experimental horizontal user nav. These changes should only appear with the redesigned_user_page_nav_enabled feature flag.
1. Created a new "Tracking" route. This combines some tracking-related settings from Notifications and Category and Tag tracking (which were separate tabs previously). Don't love the layout yet, but it's something that we can work on.
2. Moved some user-related settings out of Notifications and to the
Users tab. These seem more user-related to me, and it's nice that we can
associate enabling messages with the setting to limit who can send
messages.
3. Moved the App tab (lists app permissions) to be within the Security tab. It's very similar to Recently Used Devices.
This commits introduces a new SiteSetting.enable_new_user_profile_nav_groups
feature flag. When configured, users of the configured groups will see
the new user page navigation links.
As of this commit, only the user activity navigation link has been
converted to the newly proposed dropdown of navigation links.
Mobile support has not been considered.