Extend the libraries of icons available in the plugin

[stefan-cotitosu]

What problem does this address?

A user suggested on the forum to consider adding icons from other two libraries, as there are many free icons in each of the suggested libraries.

Those are:

https://remixicon.com/
https://pictogrammers.com/libraries/the

What is your proposed solution?

In case we decide to add more icons, we can consider those libraries.

Suggested here - https://wordpress.org/support/topic/support-for-https-pictogrammers-com/#post-17136802

Will this feature require documentation? (Optional)

I dont know.