Revert "Bump astro now that we use node v20"

This reverts commit 206ee3e.

Author: gjsjohnmurray

docs/.astro/settings.json

@@ -24,7 +24,7 @@
     "@types/node": "^18.0.0",
     "@types/react": "^17.0.45",
     "@types/react-dom": "^18.0.0",
-    "astro": "^4.16.18",
+    "astro": "^1.2.1",
     "preact": "^10.7.3",
     "react": "^18.1.0",
     "react-dom": "^18.1.0",

docs/.astro/types.d.ts

@@ -1,2 +1 @@
-/// <reference path="../.astro/types.d.ts" />
 /// <reference types="astro/client" />