updating lecture code examples

CodeExamples/Week4/ReactIntroPages/ImageImporting.txt

CodeExamples/Week4/ReactIntroPages/children.html

CodeExamples/Week4/ReactIntroPages/color_swatch.html

CodeExamples/Week4/ReactIntroPages/componentWithProps.html

CodeExamples/Week4/ReactIntroPages/firstComponent.html

CodeExamples/Week4/ReactIntroPages/meme1.jpg

CodeExamples/Week4/ReactIntroPages/meme2.jpg

CodeExamples/Week4/ReactIntroPages/reactAppScripts.html

...amples/Week4/ReactIntroPages/reactAppScriptsSkeleton.html

CodeExamples/Week4/ReactIntroPages/test.html

CodeExamples/Week4/map-data-example/.gitignore

CodeExamples/Week4/map-data-example/README.md

CodeExamples/Week4/map-data-example/package-lock.json

CodeExamples/Week4/map-data-example/package.json

CodeExamples/Week4/map-data-example/public/favicon.ico

CodeExamples/Week4/map-data-example/public/index.html

CodeExamples/Week4/map-data-example/public/manifest.json

CodeExamples/Week4/map-data-example/src/App.css

CodeExamples/Week4/map-data-example/src/App.js

CodeExamples/Week4/map-data-example/src/App.test.js