问我需要一些帮助来让我的第一个开源项目运行起来

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ShoaibKhansMBP:stop-analyzing-embed shoaibkhan$ cd app
ShoaibKhansMBP:app shoaibkhan$ npm install
npm ERR! code ERESOLVE
npm ERR! ERESOLVE unable to resolve dependency tree
npm ERR!
npm ERR! While resolving: stop-analyzing-embed@0.2.0
npm ERR! Found: react@16.13.1
npm ERR! node_modules/react
npm ERR! react@"^16.13.1" from the root project
npm ERR! peer react@">=16.9.0" from @testing-library/react-hooks@3.3.0
npm ERR! node_modules/@testing-library/react-hooks
npm ERR!
npm ERR! Could not resolve dependency:
npm ERR! peer react@"17.0.1" from react-test-renderer@17.0.1
npm ERR! node_modules/react-test-renderer
npm ERR! peer react-test-renderer@">=16.9.0" from @testing-library/react-hooks@3.3.0
npm ERR! node_modules/@testing-library/react-hooks
npm ERR!
npm ERR! Fix the upstream dependency conflict, or retry
npm ERR! this command with --force, or --legacy-peer-deps
npm ERR! to accept an incorrect (and potentially broken) dependency resolution.
npm ERR!
npm ERR! See /Users/shoaibkhan/.npm/eresolve-report.txt for a full report.

npm ERR! A complete log of this run can be found in:
npm ERR! /Users/shoaibkhan/.npm/_logs/2021-01-26T14_56_13_324Z-debug.log
ShoaibKhansMBP:app shoaibkhan$ npm run dev

stop-analyzing-embed@0.2.0 dev
REACT_APP_BACKEND_URL=http://localhost:8008 yarn start
sh: yarn: command not found
npm ERR! code 127
npm ERR! path /Users/shoaibkhan/Documents/Treehouse/Open Source Projects/stop-analyzing-embed/app
npm ERR! command failed
npm ERR! command sh -c REACT_APP_BACKEND_URL=http://localhost:8008 yarn start

npm ERR! A complete log of this run can be found in:
npm ERR! /Users/shoaibkhan/.npm/_logs/2021-01-26T14_56_33_589Z-debug.log
ShoaibKhansMBP:app shoaibkhan$