docs[patch]: Add main graph construction docs

[tomasonjo]

No description provided.

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[jacoblee93]

Thanks for this!

Seems you have some broken links:

[ERROR] Error: Docusaurus found broken links!
Please check the pages of your site in the list below, and make sure you don't reference any path that does not exist.
Note: it's possible to ignore broken links with the 'onBrokenLinks' Docusaurus configuration, and let the build pass.
Exhaustive list of all broken links found:
- On source page path = /docs/use_cases/graph/:
   -> linking to /docs/use_cases/graph/constructing
- On source page path = /docs/use_cases/graph/quickstart:
   -> linking to /docs/use_cases/graph/constructing

Could you fix them up?

[tomasonjo]

done

[jacoblee93]

Thanks!