Bug 52821: Provide link to the JSON page from navbar dropdowns.

Adds [read|edit] links to the navbar dropdowns. This provides links
to the JSON page in NS_BOOK.

Bug: 52821
Change-Id: Ida0c1d96c05334a4f23f94a8c31a89d418f89b26
Merge "Bug 52821: Provide link to the JSON page from navbar dropdowns."