Moved 'Implementing a Random Variable' to the last position in 'How To' section

[OmGhadge]

Description

I have rearranged the order of pages in the "How To" section. Specifically, I moved the page titled "Implementing a Random Variable" to the last position in the "How To" section.
Note:
Despite the indication that the requirements-dev.txt file has been modified, no changes have been made to its content. The modification is likely due to line-ending differences

Related Issue

• Closes Show Implementing a RandomVariable as the last entry in How-to #7099
• Related to #

Checklist

• Checked that the pre-commit linting/style checks pass
• Included tests that prove the fix is effective or that the new feature works
• Added necessary documentation (docstrings and/or example notebooks)
• If you are a pro: each commit corresponds to a relevant logical change

Type of change

• New feature / enhancement
• Bug fix
• Documentation
• Maintenance
• Other (please specify):

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📚 Documentation preview 📚: https://pymc--7108.org.readthedocs.build/en/7108/

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[ricardoV94]

Thanks!

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