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added description and resources for null in javascript (#6242)

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Samaila Chatto Bashir
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src/data/roadmaps/javascript/content/null@CxyNyFMuTLS3owtRMgClD.md
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# null
# null
The `null` value in JavaScript signifies the deliberate absence of any object value. It is considered as one of JavaScript's primitive values and a `falsy` value.
*Deliberate absence* emphasises the intentional use of `null` to indicate that a variable does not point to any object. This explicit declaration conveys the purposeful nature of null, showing that the variable is meant to be empty or non-existent at execution time.
In essence, `null` is a way to reset a variable, signalling that it should not reference any object.
Visit the following resources to learn more:
- [@article@What is null in JavaScript](https://www.altcademy.com/blog/what-is-null-in-javascript/)
- [@article@null in JavaScript](https://masteringjs.io/tutorials/fundamentals/null)