HOSTING: the types{} rule for feed/manifest content types

nginx maps .xml to text/xml already, so default_type is ignored for the feeds; an empty types{} block must clear the map first. The manifest was serving as application/octet-stream, which browsers may refuse to install from.

▶ 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=6274&path=1530.6221,586.10667,1376.19565&xdur=0.056

7f02f14 https://github.com/aboard-io/stellate/commit/7f02f14a6427ed0b05380a7fbdea15ab3162ddba