Several updates to the concepts page

[kmoscoe]

This PR makes several updates to the "Concepts" page:

• Removes reference to V1 APIs
• Adds mention of new resolve API for looking up DCIDs of statvars
• Fixes some missing sentence text
• Updates link to sources pages

The provenance, source, dataset section also needs some rewriting, as it's actually not really accurate. I will do that in a separate PR.

[gemini-code-assist]

Summary of Changes

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This pull request refines the 'concepts' documentation, specifically focusing on the data model. The changes aim to enhance the understanding of the Data Commons knowledge graph, how data is mapped, and how to locate specific identifiers. The updates provide more precise language and better guidance for users interacting with the platform's data and APIs.

Highlights

• Documentation Clarity: Improved the clarity and accuracy of descriptions related to the Data Commons knowledge graph, triples, and provenance.
• Statistical Variable DCID Lookup: Expanded the section on how to find DCIDs for statistical variables, providing distinct methods for using the website and API, including new API references.
• Link Updates: Updated several internal and external links for better navigation and accuracy, including the Knowledge Graph browser and Data Sources pages.

Changelog

• data_model.md
  • Clarified the mapping of provider's data to Data Commons concepts by adding 'knowledge graph'.
  • Removed a parenthetical clause regarding querying triples from some APIs, simplifying the description.
  • Updated the phrasing and link for accessing the Knowledge Graph browser.
  • Restructured the section on finding DCIDs for statistical variables, separating website and API methods.
  • Added new API methods (resolver=indicator option for REST v2 Resolve API and resolve.fetch_indicators for Python v2) for finding statistical variable DCIDs.
  • Corrected a sentence in the 'Provenance' description by removing redundant text.
  • Updated the link for 'Data Sources' pages and removed a trailing period from a list item.

Activity

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[gemini-code-assist]

Code Review

This pull request contains several good updates to the data_model.md documentation. The changes clarify concepts, add useful links and API references, and improve the overall readability. I have one minor suggestion to fix a broken link.

_{Note: Security Review has been skipped due to the limited scope of the PR.}

[n-h-diaz]

Thanks! The changes look good to me