Add beta info (and links to help/feedback) to header above puzzle for courses 1,2,3.
Merge branch 'finished' of github.com:code-dot-org/dashboard into finished
Updated information on where to find credentials
Mention browsers.json
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Update README.md
Merge branch 'finished' of github.com:code-dot-org/dashboard into finished
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Merge pull request #1015 from code-dot-org/finished

finished -> levelbuilder