Support for multiple Docs tabs

[adeelibr]

Is your feature request related to a problem? Please describe.

I have been trying to build a custom panel with Docs mdx support, but I need the default Docs Tab as well. Is there a way to have multiple docs tabs? 😅

Describe the solution you'd like

I would love to have multiple Docs tabs i.e,

.addParameters({
    docs: {
       container: DocsContainer, page: DocsPage, // to show all stories & prop definations as is
    }
    docs: { container: null, page: './path-to-some-mdx-file', tabName: 'Documentation' }, // ability to write custom page in .mdx syntax
})

Describe alternatives you've considered

A guide line on how to create a custom .mdx support panel tab

Are you able to assist bring the feature to reality?

I would love to help out.

Additional context
Add any other context or screenshots about the feature request here.

[adeelibr]

Closing issue because it already exists #8951