Use online-judge-verify-helper to test our library

[GaurangTandon]

It is as good as our current approach and also generates cool looking documentation.

Example: https://beet-aizu.github.io/library/library/combinatorics/partition.cpp.html

It only supports two judges though, however, we can use this guys (beet-aizu's) problem links to find relevant judge problems for testing our own codes.

[AnimeshSinha1309]

Are we not already using this to test our code? The documentation sure, but how is this different from our current approach? And what judges does our current approach allow?

[GaurangTandon]

I think our approach allows the same two judges only. However, I really dig the generated documentation. I believe the migration to online-judge-verify-helper should be painless, since both are very similar. Can we please do it?