WIP: Getting r3f to work with create-react-app

* Temporarily disabled ESM bundles because the current setup confuses webpack4 (but not parceljs). Since create-react-app uses webpack4, not doing this would make theatre incompatible with CRA.

examples/r3f-cra/.gitignore

@@ -0,0 +1,23 @@
+# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
+
+# dependencies
+/node_modules
+/.pnp
+.pnp.js
+
+# testing
+/coverage
+
+# production
+/build
+
+# misc
+.DS_Store
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local
+
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*