Docs: add Expo integration and purchase/subscription guidance#418

JorgeArmandoMT wants to merge 2 commits intoqonversion:developqonversion/react-native-sdk:developfrom

JorgeArmandoMT:DOCS-AGENT-SKILLJorgeArmandoMT/react-native-sdk:DOCS-AGENT-SKILLCopy head branch name to clipboard