Fix for #75 (small ui updates as well)

[commjoen]

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Fixes #75

[commjoen]

Instead of overriding for all challenges can we change the adoc files a bit so the default case would just read challenge1.adoc for example? (based on classname). You can still override the method if you like for more complex situations

For now, I have a centralized approach, this should make it a lot cleaner already :-) 👍.maybe we can revise the adoc naming itself when we have more challenges?

[commjoen]

This is not necessary if you add the challenge itself to the model. I'm changing this a bit already in another branch. Also solves the looping in the html template

i rather see this in a next iteration ;-) / aka your branch with this integrated into it :).