08_removeFromArray: Suggest trying array methods for learning practice

[eyad-alkhalidy]

Because

Encouraging learners to make use of built-in array methods helps reinforce key JavaScript concepts and promotes cleaner, more idiomatic code. Adding this note provides a subtle nudge to learners without changing the exercise itself.

This PR

• Added a note to the README encouraging the use of built-in array methods for the exercise

Issue

Closes #520

Additional Information

N/A

Pull Request Requirements

• I have thoroughly read and understand The Odin Project Contributing Guide
• The title of this PR follows the location of change: brief description of change format, e.g. 01_helloWorld: Update test cases
• The Because section summarizes the reason for this PR
• The This PR section has a bullet point list describing the changes in this PR
• If this PR addresses an open issue, it is linked in the Issue section
• If this PR includes any changes that affect the solution of an exercise, I've also updated the solution in the /solutions folder