User-First Documentation Overhaul

[abdoruzaqi]

This pull request executes a major overhaul of the FlexiRule documentation to prioritize user-friendliness and business-centric language.

Changes:

1. Terminology Rebranding: All core logic blocks have been renamed to match user-first terminology (e.g., 'Check' instead of 'Condition', 'Set Value' instead of 'Assignment').
2. Structural Reorganization: The content directory has been restructured into a clean hierarchy, separating general usage guides from advanced technical references.
3. Technical Isolation: Complex backend logic, class structures, and technical implementation details (like the Normalization Value Resolver) have been moved to the advanced-reference/architecture/ section.
4. Workflow Simplification: All pages in 'Getting Started' and 'Using the Builder' have been rewritten to focus on how to use the system rather than how it works internally.
5. Link Integrity: All internal relref links have been updated to reflect the new structure, and aliases have been added to the frontmatter of renamed pages to ensure stability for external users.

Verification was performed using hugo --gc --minify to ensure a successful build with no broken references.

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PR created automatically by Jules for task 15666388886197859643 started by @abdoruzaqi

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