hosting: don't hardcode the droplet's IP

Ahead of the repo going public. The address is public via DNS anyway, so this is not a secret — but writing it down pins a box that DNS already answers for, and it goes stale the moment the droplet is replaced. `dig +short stellate.app` is both current and correct.

▶ Play it: Neon Fiscal Year → Benthic Patience → Silken Reentry — a constellation across three families — the path is the mix https://stellate.app/?genre=citypop&seed=3215&path=1530.6221,586.10667,1376.19565&xdur=0.056

46f5ca3 https://github.com/aboard-io/stellate/commit/46f5ca3f55cdb51825fc121b2b64db77830e8ec6