Add API reference documentation using mkdocstrings

[lebrice]

This commit enhances the MkDocs documentation by:

1. Adding mkdocstrings[python] to handle auto-generation of API documentation from Python docstrings.
2. Configuring mkdocstrings in mkdocs.yml under the plugins section and updating the navigation to include an "API Reference" section.
3. Creating docs/api_reference.md with directives to generate documentation for key modules and classes in simple_parsing including:
   • simple_parsing.parsing
   • simple_parsing.helpers.serialization.serializable.Serializable
   • simple_parsing.wrappers.dataclass_wrapper
   • simple_parsing.wrappers.field_wrapper
   • simple_parsing.ArgumentParser
   • simple_parsing.helpers.hparams
4. Removing extraneous files (=1.0, =7.0) that were accidentally created in the repository root.

The documentation now includes both the examples and a browsable API reference.

[Copilot]

Pull Request Overview

This PR enhances the project documentation by integrating mkdocstrings for auto-generating API reference docs and by adding various example scripts that demonstrate advanced configuration, aliasing, and ML use-cases with simple-parsing. Key changes include:

• Adding mkdocstrings support via the new docs/api_reference.md file.
• Introducing new example files for container types, configuration files, alias handling, and ML scripts.
• Removing extraneous root files that were mistakenly created.

Reviewed Changes

Copilot reviewed 68 out of 68 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
docs/api_reference.md	New file that auto-generates the API reference using mkdocstrings.
docs/examples/container_types/*.py	Examples demonstrating parsing of container-type arguments with simple_parsing.
docs/examples/config_files/*	New YAML and Python examples showcasing configuration file usage and composition.
docs/examples/aliases/*.py and docs/examples/aliases/README.md	Samples and detailed documentation for using argument aliases with the parser.
docs/examples/ML/*.py and docs/examples/ML/README.md	Before/after examples for ML scripts transitioning from argparse to simple_parsing.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.29%. Comparing base (2a69ceb) to head (4b1e5fe).

Additional details and impacted files

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##           master     #355   +/-   ##
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  Coverage   86.29%   86.29%           
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  Files          34       34           
  Lines        4554     4554           
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  Hits         3930     3930           
  Misses        624      624           

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