fix: ValidateURL failing tests (TheAlgorithms#1394)

* test: remove ValidateUrl.test.js

The code was removed with ecac786 but the test was left here (and has been failing since then, obviously 🤣)

* test: remove conflicting test case

There is another test case that explicitly expects the `null` result when the input array only contains one element.

* Updated Documentation in README.md

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Co-authored-by: github-actions <${GITHUB_ACTOR}@users.noreply.github.com>

Author: defaude

Maths/test/ParityOutlier.test.js

@@ -9,11 +9,6 @@ describe('Testing parityOutlier function', () => {
     expect(parityOutlier([177, 5, 76, 1919])).toBe(76)
   })
 
-  it('should, if the given array has only one integer element, return the integer itself', () => {
-    expect(parityOutlier([83])).toBe(83)
-    expect(parityOutlier([54])).toBe(54)
-  })
-
   it('should, if the given array has only an odd and an even number, return the odd outlier', () => {
     expect(parityOutlier([1, 2])).toBe(1)
     expect(parityOutlier([4, 3])).toBe(3)