BogoSort.js: Simplify Array.isSorted() and add doctests

[cclauss]

As discussed at #164 (comment)

Also related to add doctests as discussed in #142

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[cclauss]

The one downside with running doctests is that code at global scope is executed. This is the same in Python so in that repo we suggest indenting global code under if __name__ == "__main__":. Is there a similar JavaScript construct that we could recommend in this repo for use with doctests?

running doctests in Sorts/BogoSort.js...
[
  5, 6,  7,  8,
  1, 2, 12, 14
]
[
  1, 2,  5,  6,
  7, 8, 12, 14
]
....

[itsvinayak]

@cclauss, great work sir

[poyea]

Thank you!