[Track config.json]: Exercises are not in an Obvious Order

[BethanyG]

In looking at the tracks config.json, I noticed that exercises aren't ordered alphabetically nor by difficulty.

While that's fine (and there may be an order I am not seeing here), I do know that many students on other tracks have had expectations of steadily increasing difficulty, or some other "ordering" like exercise name when it comes to the exercise grid -- which is generated from the ordering in config.json.

Screengrab of an exercise grid for refrence:

[axtens]

I'll put them in order of difficulty. Granted, there's an arbitrariness even there but some kind of order would be better than no order at all.

[axtens]

https://github.com/exercism/euphoria/pull/70