docs: add language tour outline

book/src/SUMMARY.md

@@ -2,6 +2,25 @@
 
 - [Introduction](./introduction.md)
 - [Getting Started](./getting-started.md)
+- [Language Tour](./language-tour.md)
+  - [Comments](./language-tour/comments.md)
+  - [String](./language-tour/string.md)
+  - [Bool](./language-tour/bool.md)
+  - [Int](./language-tour/int.md)
+  - [Data](./language-tour/data.md)
+  - [Variables](./language-tour/variables.md)
+  - [Blocks](./language-tour/blocks.md)
+  - [List](./language-tour/list.md)
+  - [Tuple](./language-tour/tuple.md)
+  - [Matching](./language-tour/matching.md)
+  - [Functions](./language-tour/functions.md)
+  - [Custom types](./language-tour/custom-types.md)
+  - [Option](./language-tour/option.md)
+  - [Assert](./language-tour/assert.md)
+  - [Check](./language-tour/check.md)
+  - [Todo](./language-tour/todo.md)
+  - [Constants](./language-tour/constants.md)
+  - [Type aliases](./language-tour/type-aliases.md)
 - [Untyped Plutus Core](./uplc.md)
   - [Syntax](./uplc/syntax.md)
   - [Command-line utilities](./uplc/cli.md)

book/src/language-tour.md

@@ -0,0 +1,7 @@
+# Language Tour
+
+In this section we explore the fundamentals of the
+Aiken language. We'll go over syntax, types, control flow,
+and more. If you have prior programming experience this should
+be enough to get you started with Aiken. We also at times touch on
+how things behave and are represented at runtime.

book/src/language-tour/assert.md

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+# Assert

book/src/language-tour/blocks.md

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+# Blocks

book/src/language-tour/bool.md

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+# Bool

book/src/language-tour/check.md

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+# Check

book/src/language-tour/comments.md

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+# Comments

book/src/language-tour/constants.md

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+# Constants

book/src/language-tour/custom-types.md

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+# Custom types

book/src/language-tour/data.md

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+# Data

book/src/language-tour/functions.md

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+# Functions

book/src/language-tour/int.md

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+# Int

book/src/language-tour/list.md

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+# List

book/src/language-tour/matching.md

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+# Matching

book/src/language-tour/option.md

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+# Option

book/src/language-tour/string.md

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+# String

book/src/language-tour/todo.md

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+# Todo

book/src/language-tour/tuple.md

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+# Tuple

book/src/language-tour/type-aliases.md

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+# Type aliases

book/src/language-tour/variables.md

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+# Variables