Project totalSupply not updated

[bal7hazar]

In the current version, buy and airdrop won't trigger a totalSupply update.

A good solution could be to manage it in project.handleTransfer, if sender is the null address (so it is a token creation) then update totalsupply.

[MartianGreed]

For farming necessities, we also need to fetch project based on the slug defined frontend side.

• Add a slug @unique column in Project table
• During indexation get external_url from ipfs metada and parse out slug from there.