Raindrops 48in24 approaches

[michalporeba]

Resolves #1420

I'm trying a different approach to approaches than the one I used in the leap. Rather than focusing on the features of the language I'm focusing on two logical approaches and showing how they can be implemented differently using various features of the language. Let me know what you think.

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[michalporeba]

Link checkers will fail until the first deployment, as this PR will create the missing pages.