Gigasecond Improvement

[lpalma]

While working on Gigasecond exercise, as part of #473, I noticed two things:

1. The exercise is not documented in the exercises page;
2. The function name fromDay may be confusing for beginners since it doesn't take a day, but rather a UTCTime. What about simply from or fromUtcTime ?

Perhaps this repository is not responsible for 1 and it should be raised in exercism.io instead?

[petertseng]

The exercise is not documented in the exercises page;

Because it is deprecated in this repo, and deprecated exercises intentionally do not show up in the list.

Do we want to cover deprecated exercises too as part of #473?

The function name fromDay may be confusing for beginners since it doesn't take a day, but rather a UTCTime. What about simply from or fromUtcTime ?

Sure, either seems reasonable. I guess it was called fromDay because despite taking in a UTCTime, the time always had the hour/minute/second set to zero, but that is caused by the tests, not the function - the function would reasonably be able to accept any UTCTime, not just those at 00:00:00

[lpalma]

I think this can be closed now following #473 (comment)