docs(example): update READMEs for JS-first init and Firebase push setup#346

evan-masseau wants to merge 3 commits intofeat/example-appklaviyo/klaviyo-react-native-sdk:feat/example-appfrom

ecm/example-app/5-docsklaviyo/klaviyo-react-native-sdk:ecm/example-app/5-docsCopy head branch name to clipboard