Feature/challenge

[UlrikeWerner]

• add the challenges page
• start -> navigation to the active challenge site
• add activities to the active challenge and show the list chronologically ordered

close #18 #17 #8

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Name	Status	Preview	Updated
capstone-project	✅ Ready (Inspect)	Visit Preview	Jul 4, 2022 at 3:07PM (UTC)

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🎊 PR Preview a74676a18001d2b444f834acf8dbeab5a3774c9e has been successfully built and deployed to https://UlrikeWerner-capstone-project-tests-pr-22.surge.sh

:clock1: Build time: 61.285s

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