Integrate conda-store-ui docs with Storybook plugin

[pavithraes]

We have the conda-store-ui docs created in Storybook here: https://conda-incubator.github.io/conda-store-ui/?path=/story/welcome--page

While we can move the narrative docs directly, Storybook autogenerates the component docs. We need a way to include without duplication in the new docusaurus docs.

[pavithraes]

Originally, we were going to use the Storybook Docusaurus addon plugin, but looking into it further, it actually does the opposite. It allows us to use Docusaurus components in Storybook - which is not what we want.

Ref: facebook/docusaurus#7713

As per the discussion linked above, the best course of action is to use an iframe