modify "discourse" in the way that:
- initial user (admin) starts a "chain"
- can seed with max. 10 users: ten invites to ten email accounts
- after initial chain, a user can send only 1 invite to 1 email account
- existing chains listed in home page + new chain option
- a user can only access registered chain(s)
deploy to heroku (and receive payment)
share the code to fork on github