Remove duplicate link (#4531)

* Update 101-prototypal-inheritance.md

url "The Modern JavaScript Tutorial" is the same link as "Prototype Inheritance".

* Update src/data/roadmaps/javascript/content/102-javascript-datatypes/101-object/101-prototypal-inheritance.md

---------

Co-authored-by: Kamran Ahmed <kamranahmed.se@gmail.com>

src/data/roadmaps/javascript/content/102-javascript-datatypes/101-object/101-prototypal-inheritance.md

@@ -6,5 +6,4 @@ Visit the following resources to learn more:
 
 - [JavaScript MDN Docs](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Inheritance_and_the_prototype_chain)
 - [GeeksForGeeks – JavaScript Tutorial](https://www.geeksforgeeks.org/prototypal-inheritance-using-__proto__-in-javascript/)
-- [The Modern JavaScript Tutorial](https://javascript.info/prototype-inheritance)
 - [Prototype Inheritance](https://javascript.info/prototype-inheritance)