Update Readme with information for multiple spaces

[alex-tgk]

Added in an explanation for sourcing from multiple Contentful environments/spaces. This is a topic I have seen come up multiple times in the community so I thought it warranted adding it here.

Description

Documentation

Related Issues

[laurieontech]

Thanks for the PR!

I noticed that you have a couple uses of "simple" in your current text. As the styleguide suggests it would be great to replace those (or remove them) to make the write up more approachable.

Really appreciate your contributions!

[alex-tgk]

Thanks for the PR!

I noticed that you have a couple uses of "simple" in your current text. As the styleguide suggests it would be great to replace those (or remove them) to make the write up more approachable.

Really appreciate your contributions!

No problem! Updated with more concise verbiage.

[laurieontech]

Thanks for the updates! Made one suggestion but this looks good. Next step is to verify it. Will add it to the list of PRs for review.

[marcysutton]

I've confirmed this works. My only request is to mark the gatsby-config.js filename in backticks so it reads as code in a paragraph. Otherwise this is good to go! Thanks for the PR!

[marcysutton]

Awesome. Thanks for the PR!

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