docs: rename API Reference to Code Documentation

docs/code_documentation/__main__.md

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+# __main___
+
+::: rendercv.__main__

docs/code_documentation/data_model.md

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+# Data Model
+
+::: rendercv.data_model

docs/code_documentation/index.md

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+# RenderCV
+
+::: rendercv
+
+In this section, you can find how RenderCV works in detail.
+
+Modules:
+
+- [\_\_main\_\_](__main__.md) – This module contains the main functions of RenderCV.
+- [data_model](data_model.md) – This module contains classes and functions to parse RenderCV's specifically structured YAML or JSON to generate meaningful data for Python.
+- [rendering](rendering.md) – This module implements $\LaTeX$ file generation and $\LaTeX$ runner utilities for RenderCV.

docs/code_documentation/rendering.md

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+# Rendering
+
+::: rendercv.rendering