Buyback and Distribute ARCH

Summary: Marketing campaign for Archer Swap:

1. Everyone who swaps through Archer Swap receives ARCH tokens.
2. ARCH tokens are purchased from the market using revenue.
3. The promotion terms are revisited after six weeks.

The promotion (swap on Archer Swap; earn ARCH) should include trading activity from June 4 00:00 UTC. Rewards should be paid weekly, proportional to trading activity.

Motivation: Start flywheel effect with more traders and volume through Archer Swap. Demonstrate TEV with tangible rewards. Diversify token holders. Get product feedback from a wider group of users.