Fix broken menu in the docs

[xavimb]

Pull Request Description

Please provide a brief description of your changes.

This fixes the menus in the docs, both the broken links of the /code path and preserving the right order in the /guide path

Related Issue(s)

• This PR fixes/closes issue All links on API documentation Readme are broken #407
• This is a new feature and does not have an associated issue.

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Additional Information

• This change is a breaking change (may require a major version update)
• This change is a new feature (non-breaking change which adds functionality)
• This change improves the code (e.g., refactoring, etc.)
• This change includes dependency updates

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Test Cases

Include any test cases or steps you took to test your changes. If you have added new functionality, please include relevant unit tests.

Manually tested: the side menus of the /guide and /code sections in the documentation point to the correct place.

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Documentation

• I have updated the documentation accordingly.
• No updates are required.

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Checklist

• I have read the CONTRIBUTING documentation.
• My code follows the coding standards of this project.
• All new and existing tests passed.