Improving on the first draft of the Leap approaches

[michalporeba]

This is a PR to collect all the fixes to the initial version of the Leap approaches.
It relates to #1401 and the 48in24 challenge.

Let's wait until the end of today to collect any feedback and resulting updates before merging.

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[michalporeba]

The problem is with the link to a video about binary number conversions in the Paint by Numbers exercise. The video https://www.youtube.com/watch?v=gGiEu7QTi68 is no longer available, as it is marked private.

[michalporeba]

@angelikatyborska, from my perspective, I'm happy to merge it. At the moment I'm not planning any more commits.

[angelikatyborska]

Thank you!