Fixed decorator image and text in BT basics

[sprkrd]

Addresses issues #16 and #58.

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🔨 Latest commit	89f05b5

[facontidavide]

This logic in your PR seems wrong to me, because if door is open, the sequence fails (it should not fail)

[sprkrd]

This logic in your PR seems wrong to me, because if door is open, the sequence fails (it should not fail)

@facontidavide Of course, it's wrong. But I believe that is exactly the point of the "Find the bug!" text box later. The correct tree would look either like that of Commit 3b8a37c or like this:

But...

1. At this point, the Fallback node hasn't been introduced yet (thus ruling out the image from Commit 3b8a37c)
2. The section is meant to show an example of a decorator (thus partially ruling out the tree that I propose in the above image, there's actually another decorator that serves as an example).
3. Like I said earlier, the "Find the bug!" text box later acknowledges the very mistake you've mentioned. In my PR I've expanded a bit on the original explanation. This rules out any correct version of the tree, and the only tree that is left as a valid candidate is the one from before Commit 3b8a37c with a Sequence instead of a Fallback.

[sprkrd]

Alternatively, the image after Commit 3b8a37c can be maintained but:

1. The fallback node should be introduced before the decorator node.
2. The "Find the BUG!" text box should be removed.