fix: NIP-05 CORS error

NIP-05 validation requests to the domian were
rejected due to CORS

netlify.toml

@@ -1,3 +1,7 @@
 [build]
     command = "yarn run build"
-    publish = "build"
+    publish = "build"
+[[headers]]
+    for = "/.well-known/nostr.json"
+    [headers.values]
+    Access-Control-Allow-Origin = "*"