architecture overview: add link to command line reference
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@@ -24,7 +24,7 @@ Nix consists of hierarchical [layers](https://en.m.wikipedia.org/wiki/Multitier_
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```
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At the top is the *command line interface*, translating from invocations of Nix executables to interactions with the underlying layers.
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At the top is the [command line interface](../command-ref/command-ref.md), translating from invocations of Nix executables to interactions with the underlying layers.
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Below that is the [Nix expression language](../expressions/expression-language.md), a [purely functional](https://en.m.wikipedia.org/wiki/Purely_functional_programming) configuration language.
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It is used to compose expressions which ultimately evaluate to self-contained *build plans*, made up *build tasks* used to derive *build results* from referenced *build inputs*.
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