Remove frankenstein code from useAssetsFolder for 2.0.0 release

[roedoejet]

No description provided.

[deltork]

We will have to update the some of the cypress tests as well

[joanise]

The "Frankenstein" code refers to

Studio-Web/packages/web-component/src/components/read-along-component/read-along.tsx

Lines 98 to 116 in 3bbad6b

	/**
	* DEPRECATED
	* Toggle the use of an assets folder. Defaults to undefined.
	* Previously (<1.2.0) defaulted to 'true'.
	* .readalong files should just contain base filenames
	* not the full paths to the images.
	*/
	@Prop() useAssetsFolder?: boolean;
	/**
	* Define a path for where the image assets are located
	* This should be used instead of use-assets-folder.
	* Defaults to 'assets/'. The empty string means that
	* image paths will not have a prefix added to them.
	* Use of the forward slash is optional.
	*/
	@Prop() imageAssetsFolder: string = "assets/";

and all uses of useAssetsFolder later in the file.