Add config system

Introduce ability to change default settings for the app.
Currently starting with disabling i18n debug on prod server

Signed-off-by: Sudhanshu Gautam <me@sudhanshug.com>

src/config.js

@@ -0,0 +1,11 @@
+const defaults = {};
+const prod = {
+  i18nDebug: false,
+};
+const dev = {
+  i18nDebug: true,
+};
+export default {
+  ...defaults,
+  settings: process.env.NODE_ENV === 'development' ? dev : prod,
+};