User-First Documentation Overhaul

[abdoruzaqi]

This submission executes a major structural and content overhaul of the FlexiRule documentation. It prioritizes user-friendly, business-centric language, separates technical reference from core guides, and ensures full site integrity under the new hierarchy. Key changes include:

• New logical hierarchy: Getting Started, Using the Builder, Core Actions, and Advanced Reference.
• Rewritten action guides with business terminology (e.g., 'Set Value', 'Check', 'Repeat').
• Consolidation of technical sub-pages into unified user guides.
• Global update of all internal 'relref' links to maintain site integrity.
• Updated home page for improved discovery.

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PR created automatically by Jules for task 10545954514358164743 started by @abdoruzaqi

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