docs: create how to work with design tokens

[dcoa]

This PR adds a how-to about design tokens support for the brand package.

There are still details to evaluate such as whether should we install Paragon as a dev dependency and the possible creation of a Paragon CLI command specific to this package.

Any early feedback should be great @brian-smith-tcril and @PKulkoRaccoonGang.

[openedx-webhooks]

Thanks for the pull request, @dcoa!

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[mphilbrick211]

Hi @dcoa! Just checking in on this!

[dcoa]

Hi, @mphilbrick211 this is a work in progress I will allocate some time in the following weeks to finish it. Sorry for that.