docs: fix CI and remove LGTM badges (TheAlgorithms#1269)

* Updated Documentation in README.md

* docs: fix CI and remove LGTM badges

LGTM is no longer a supported service and has been integrated with GitHub (which is now CodeQL).
We can create a CodeQL workflow and integrate it into the repository, however, that fits for another PR.

The shields badge API was updated, thus, causing an invalid badge: badges/shields#8671

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

Author: Panquesito7

DIRECTORY.md

@@ -185,8 +185,10 @@
   * [FindMaxRecursion](Maths/FindMaxRecursion.js)
   * [FindMin](Maths/FindMin.js)
   * [FindMinIterator](Maths/FindMinIterator.js)
+  * [FriendlyNumbers](Maths/FriendlyNumbers.js)
   * [GetEuclidGCD](Maths/GetEuclidGCD.js)
   * [GridGet](Maths/GridGet.js)
+  * [HexagonalNumber](Maths/HexagonalNumber.js)
   * [IntToBase](Maths/IntToBase.js)
   * [IsDivisible](Maths/IsDivisible.js)
   * [IsEven](Maths/IsEven.js)
@@ -227,6 +229,7 @@
   * [ShorsAlgorithm](Maths/ShorsAlgorithm.js)
   * [SieveOfEratosthenes](Maths/SieveOfEratosthenes.js)
   * [SieveOfEratosthenesIntArray](Maths/SieveOfEratosthenesIntArray.js)
+  * [Signum](Maths/Signum.js)
   * [SimpsonIntegration](Maths/SimpsonIntegration.js)
   * [Softmax](Maths/Softmax.js)
   * [SquareRoot](Maths/SquareRoot.js)

README.md

@@ -7,7 +7,6 @@ JavaScript Repository of TheAlgorithms, which implements various algorithms and
 
   [![JavaScript Banner][banner]](DIRECTORY.md)
 
-  [![Language grade: JavaScript][grade]][lgtm]
   [![Checks][checks]][actions]
   [![Contributions Welcome][welcome]](CONTRIBUTING.md)
   [![standard.js][standard-logo]][standard-js]
@@ -47,15 +46,13 @@ many of the algorithms can be found in the [wiki][explanation].
 [standard-logo]: https://img.shields.io/badge/code%20style-standardjs-%23f3df49
 [chat]: https://img.shields.io/discord/808045925556682782.svg?logo=discord&colorB=7289DA
 [welcome]: https://img.shields.io/static/v1.svg?label=Contributions&message=Welcome&color=0059b3
-[checks]: https://img.shields.io/github/workflow/status/TheAlgorithms/JavaScript/Node%20CI?label=checks
-[grade]: https://img.shields.io/lgtm/grade/javascript/g/TheAlgorithms/Javascript.svg?logo=lgtm&logoWidth=18
+[checks]: https://img.shields.io/github/actions/workflow/status/TheAlgorithms/JavaScript/Ci.yml?branch=master&label=checks
+[grade]: https://img.shields.io/lgtm/grade/javascript/g/TheAlgorithms/JavaScript.svg?logo=lgtm&logoWidth=18
 
 <!-- External Links -->
 [standard-js]: https://standardjs.com/
 [discord-server]: https://the-algorithms.com/discord/
 [actions]: https://github.com/TheAlgorithms/JavaScript/actions
 [explanation]: https://github.com/TheAlgorithms/JavaScript/wiki
 [repositories]: https://github.com/orgs/TheAlgorithms/repositories
-[lgtm]: https://lgtm.com/projects/g/TheAlgorithms/Javascript/context:javascript
 [help-wanted]: https://github.com/TheAlgorithms/JavaScript/issues?q=is%3Aopen+is%3Aissue+label%3A%22help+wanted%22
-