Notify: Settings page

[gabestein]

Motivation

• So users can configure their notify settings

Requirements

• Proposed: change "API Tokens" page to be just "API", and add a notify section that can be toggled on or off
• When on, requests to new "inbox" api route should be processed. When off, route should return 404.
• When on, allows users to specify what stage incoming notify pubs should be placed in
• When on, includes link to notify action defaults page
• When on, allows users to specify arrays of target services they will accept inbound requests from (as URIs)

Acceptance Criteria

• We should probably generate a notify pub "type," with notify fields, that gets added to the community when this gets turned on for the first time? Alternately, we could have the user specify one when on that they have to configure, but that seems like a huge burden on them.
• Do not worry about turning action on or off, it can always be on for now — in future we could allow community admins to toggle actions on or off for their communities