Revert "Expose FluentContext as public API"

This reverts commit 397cfd0. The
current public API is sufficient for all supported use-cases. We might
want to extend it in the future, e.g. if we implement a useLocalization
hook. For now however, it's safer to keep the public API as minimal as
possible.

Author: stasm

fluent-react/src/index.js

@@ -17,7 +17,6 @@
  * components for more information.
  */
 
-export { default as FluentContext } from "./context";
 export { default as LocalizationProvider } from "./provider";
 export { default as withLocalization } from "./with_localization";
 export { default as Localized } from "./localized";