Document how stack uses the Cabal library in Architecture.md#4494

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dbaynard merged 5 commits intocommercialhaskell:stablefrom

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Feb 11, 2019

Commits on Jan 8, 2019

Document how stack uses the Cabal library in FAQ
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Commits on Jan 20, 2019

Commits on Feb 10, 2019

Describe the behaviour of stack with build-type: Custom
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Commits on Feb 11, 2019

Move documentation on Cabal from FAQ to Architecture document
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