deploy

Revise challenge and example sections in README (#18) #203

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Run time

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Job	Run time
🔧 Setup (windows-latest)	2m 18s
🚀 Deploy	2m 22s
🧪 Test	59s
🔧 Setup (macos-latest)	1m 36s
🔧 Setup (ubuntu-latest)	48s
	8m 3s