chore(build): try to build demo and docs (#3434)

platform/app/public/_headers

@@ -0,0 +1,6 @@
+/*
+  # Ensure the examples are cross-origin isolated so that
+  # we can use SharedArrayBuffer
+  # See https://developer.mozilla.org/en-US/docs/Web/API/crossOriginIsolated
+  Cross-Origin-Embedder-Policy: require-corp
+  Cross-Origin-Opener-Policy: same-origin