Improve Data Files docs

[moorereason]

The Data Files page says:

As explained in Source Organization, the data folder is where you can store additional data for Hugo to use when generating your site.

Looking at the Source Organization page, it says virtually nothing about the data and content folders. This section of the Data Files page needs to be cleaned up. Remove reference to Source Organization and make it clear that the Data Files are supplemental to the primary content.

Some context in this discussion thread. User thought the data folder could be treated like a content folder to generate new pages.

[github-actions]

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