feat: remove duplicated `gcd`-like functions

TheAlgorithms / JavaScript

Algorithms and Data Structures implemented in JavaScript for beginners, following best practices.

GNU General Public License v3.0

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Describe your change:

This PR removes the duplicated implementation of recursive gcd and moves an iterative one to Maths.

Checklist:

[x] I have read CONTRIBUTING.md.
[x] This pull request is all my own work -- I have not plagiarized.
[x] I know that pull requests will not be merged if they fail the automated tests.
[x] ~This PR only changes one algorithm file. To ease review, please open separate PRs for separate algorithms.~
[x] All new JavaScript files are placed inside an existing directory.
[x] All filenames should use the UpperCamelCase (PascalCase) style. There should be no spaces in filenames. Example:UserProfile.js is allowed but userprofile.js,Userprofile.js,user-Profile.js,userProfile.js are not
[x] All new algorithms have a URL in their comments that points to Wikipedia or another similar explanation.
[x] If this pull request resolves one or more open issues then the commit message contains Fixes: #{$ISSUE_NO}.

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 84.07%. Comparing base (0204198) to head (71057b1).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1642 +/- ## ========================================== + Coverage 83.92% 84.07% +0.14% ========================================== Files 376 375 -1 Lines 19698 19688 -10 Branches 2910 2914 +4 ========================================== + Hits 16532 16552 +20 + Misses 3166 3136 -30 ```

TheAlgorithms / JavaScript