chore: create well-known dir; fix 404

netlify.toml

@@ -64,3 +64,8 @@ for = "/.well-known/webfinger"
 for = "/.well-known/gpc.json"
   [headers.values]
   Content-Type = "application/jrd+json; charset=utf-8"
+
+[[headers]]
+for = "/.well-known/traffic-advice"
+  [headers.values]
+  Content-Type = "application/trafficadvice+json"

src/well-known/traffic-advice.liquid

@@ -0,0 +1,11 @@
+---
+permalink: '.well-known/traffic-advice'
+eleventyExcludeFromCollections: true
+dynamicPermalink: false
+---
+[{
+  "user_agent": "prefetch-proxy",
+  "google_prefetch_proxy_eap": {
+    "fraction": 1.0
+  }
+}]