Add notes of caution about `sideEffects` key in `package.json`#2

KonnorRogers wants to merge 2 commits intocoryrylan:maincoryrylan/reusable-ui-component-api-guide:mainfrom

KonnorRogers:patch-1KonnorRogers/reusable-ui-component-api-guide:patch-1Copy head branch name to clipboard