[racket] New web pages!

From: Helmut Dobretzberger (h.dobretzberger at gmx.at)
Date: Wed Mar 12 16:59:33 EDT 2014

Nice new web page!

A few errors I get on visiting the page on small devices:
- The "<" and ">" to switch between the examples overlays "Start quickly"
- Explain overlays the first line of the example-code
- Clicking on "explain" also doesn't show the explanation 


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