Convert code samples to interactive sessions

[pdawyndt]

Some code samples could be rewritten as interactive sessions. For example:

fruitlist = ["apple", "banana", "cherry", "durian", "orange"]
print( fruitlist )
fruitlist[1:3] = []
print( fruitlist )

could be rewritten as

>>> fruitlist = ["apple", "banana", "cherry", "durian", "orange"]
>>> print( fruitlist )
['apple', 'banana', 'cherry', 'durian', 'orange']
>>> fruitlist[1:3] = []
>>> print( fruitlist )
['apple', 'durian', 'orange']

[pdawyndt]

Convert to executable code snippets when Dodona adds support for this (https://github.com/dodona-edu/dodona/issues/1575).