feat: ✨ remove old version 15.2.x

[aaronm-2112]

Summary by Sourcery

Remove legacy version 12.x documentation and clean up its entries

Chores:

• Delete versioned_docs/version-12.x directory and related sidebar configuration
• Remove version-12.x entry from versions.json

[fairdataihub-bot]

Thank you for submitting this pull request! We appreciate your contribution to the project. Before we can merge it, we need to review the changes you've made to ensure they align with our code standards and meet the requirements of the project. We'll get back to you as soon as we can with feedback. Thanks again!

[sourcery-ai]

Reviewer's Guide

This PR cleans up legacy documentation by removing the entire version-12.x docs and sidebar configuration, and updates versions.json to drop the outdated version entry.

File-Level Changes

Change	Details	Files
Removed legacy version-12.x documentation and sidebar config	Deleted all markdown and category files under versioned_docs/version-12.x Removed the version-12.x sidebars configuration file	versioned_docs/version-12.x/** versioned_sidebars/version-12.x-sidebars.json
Updated versions.json to remove v12.x entry	Removed '12.x' from the versions array	versions.json

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Name	Status	Preview	Comments	Updated (UTC)
soda-for-sparc-docs	❌ Failed (Inspect)			May 19, 2025 10:50pm

[fairdataihub-bot]

Thanks for making updates to your pull request. Our team will take a look and provide feedback as soon as possible. Please wait for any GitHub Actions to complete before editing your pull request. If you have any additional questions or concerns, feel free to let us know. Thank you for your contributions!

[sourcery-ai]

Hey @aaronm-2112 - I've reviewed your changes and they look great!

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Documentation: all looks good

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