Move to escapement.warehack.ing; fix GFM tables in MDX

The landing page's headline results table was rendering as a paragraph of raw
pipe characters. Astro applies remark-gfm to .md but it wasn't reaching the MDX
pipeline, so every .md page rendered tables fine and only index.mdx was broken —
which is exactly why it went unnoticed. mdx({remarkPlugins:[remarkGfm]}) fixes it.

cuckoo.warehack.ing stays as a permanent redirect; it was live briefly.

docs-site/package.json

@@ -14,6 +14,7 @@
     "@astrojs/sitemap": "^3.7.2",
     "@astrojs/starlight": "^0.39.2",
     "astro": "^6.3.1",
+    "remark-gfm": "^4.0.1",
     "sharp": "^0.34.0",
     "starlight-links-validator": "^0.24.0"
   }