Add bilingual manual and localized docs routes

doc/manual/source/index.md

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+# Decodal Manual
+
+This manual describes the Decodal language and the public APIs for embedding it in applications.
+Decodal is the project name for the Deferred Constraint Data Language, abbreviated DCDL.
+
+## Contents
+
+1. [Introduction](./introduction.md)
+2. [Language Specification](./language/index.md)
+   1. [Lexical Structure and Syntax](./language/syntax.md)
+   2. [Grammar](./language/grammar.md)
+   3. [Value](./language/value/index.md)
+      1. [String](./language/value/string.md)
+      2. [Int](./language/value/int.md)
+      3. [Float](./language/value/float.md)
+      4. [Bool](./language/value/bool.md)
+   4. [Expression](./language/expression/index.md)
+      1. [Literal](./language/expression/literal.md)
+      2. [Identifier](./language/expression/identifier.md)
+      3. [Path Reference](./language/expression/path-reference.md)
+      4. [Object](./language/expression/object.md)
+      5. [Array](./language/expression/array.md)
+      6. [Function](./language/expression/function.md)
+      7. [Function Call](./language/expression/function-call.md)
+      8. [Let](./language/expression/let.md)
+      9. [Match](./language/expression/match.md)
+      10. [Import](./language/expression/import.md)
+      11. [Composition](./language/expression/composition.md)
+      12. [Range Refinement](./language/expression/ascription.md)
+      13. [Default](./language/expression/default.md)
+      14. [Arithmetic](./language/expression/arithmetic.md)
+      15. [Logical and Comparison](./language/expression/logical-and-comparison.md)
+   5. [Constraints and Defaults](./language/constraints-and-defaults.md)
+   6. [Operators](./language/operators.md)
+   7. [Functions](./language/functions.md)
+   8. [Modules and Imports](./language/modules-and-imports.md)
+   9. [Evaluation Semantics](./language/evaluation.md)
+   10. [Materialization and Errors](./language/materialization-and-errors.md)
+   11. [Naming](./language/naming.md)
+   12. [Examples](./language/examples.md)
+3. [Embedding](./embedding.md)
+4. [Packages and Integrations](./components.md)