Add table of contents and encourage people to leave feedback in working group in Architecture Overview intro - #2996

Add table of contents and encourage people to leave feedback in working group in Architecture Overview intro#2996

sammy-SC merged 4 commits into

react:mainreact/react-native-website:mainfrom

sammy-SC:architecture-overview-intro-table-of-contentssammy-SC/react-native-website:architecture-overview-intro-table-of-contentsCopy head branch name to clipboard