* archive old referral offer doc
* init referral manager
* add Referral Manager CLI definition
* add draft implementation steps
* use existing registration_token table for storing invitation tokens
* fix numbering
* add open question about auth
* wip pseudocode
* add user interface design
* separate token generation step from getting users step
* change button to be a referral tab on the UI
* simplify some sentences. clarified CLI referral manager interaction
* add prevent two processes running at the same time
* add cli code
* clear users when CLI exites earlier or referral manager finishes sending tokens to satellites
* use transaction for saving tokens on satellite so we can roll back if error occurs
* add auth token and GetSatelliteURLs
* add schema for satellites table
* update to only have satelite to talk to referral manager
* add definition for eligible users and owner's satellite
* fix indentation
* add saving user info during redeem pseudocode
* wip
* address reviews
* add unredeemed token in users table
* address comments
we've decided to rename design docs to blueprints to indicate that we don't intend to keep blueprints up to date once completed. instead, the final step of blueprint implementation is to archive the blueprint and update actual documentation elsewhere (potentially copying and pasting most of the blueprint). this PR updates the template and readme
