User-First Documentation Overhaul

[abdoruzaqi]

This PR executes a complete overhaul of the FlexiRule documentation to make it "user-first."

Key changes:

1. Structural Reorganization: Content is now organized into intuitive sections (Getting Started, Using the Builder, Core Actions, Advanced Reference) with explicit weights for sidebar ordering.
2. User-Centric Content: Every functional guide (e.g., Query Records, Notify, Update Record) has been rewritten to prioritize "When to Use" and "How to Configure" from a business user's perspective.
3. Technical Isolation: Highly technical architecture details, such as Python handler class structures and internal normalization logic, have been moved to the advanced-reference/architecture/ directory to avoid cluttering the primary user experience.
4. Hugo Optimization: All internal links have been updated to use relref shortcodes, and section metadata is correctly managed via _index.md files.
5. Styling Compliance: Removed any traces of Tailwind CSS or custom inline styles, relying exclusively on standard Markdown and the custom Hugo theme.

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PR created automatically by Jules for task 10331441771544178874 started by @abdoruzaqi

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