docs(global): 📝 update documentation related to CoreButton

[PritamBag]

Is your feature request related to a problem? Please describe.
Documentation related to CoreButton(e.g. CoreOutlinedButton, etc.) is incomplete so an updation of this documentation is needed.

Describe the solution you'd like
Just update the documentation.

Describe alternatives you've considered

Additional context

[PritamBag]

@PritamIT2023, @anantakumarghosh as we have discussed we are going with CoreButton only, so we have to remove those other buttons