Implement function to toggle display when button is pressed

[mre1ght]

Current Situation

The display is toggled using input and labeltags.

Ideal Situation

Implement the display toggle functionality using JavaScript.

Reason

The functionality to toggle display by pressing a button will be frequently used in the future. Let's learn how to use it for study purposes.

Reference

https://www.pyxofy.com/how-to-toggle-display-with-javascript/

[rhmtrz]

@mre1ght

If this method is used, the structure will be changed. It required refactoring. let's do this in the next version of the app.