Background category and releasing bg-replace

Updates:
New Parameter Addition: bg-replace
New Category: Background

We added a new parameter, bg-replace, to the documentation.

Parameters moved to the background category:

Background-remove: Removes backgrounds from images.
bg: Specifies or modifies image backgrounds.
bg-replace: Introduces the ability to replace image backgrounds.
We are evaluating other parameters to be included in this category.

These changes aim to enhance documentation clarity and organization, facilitating easier navigation for the users.