Reorder SQL Quick Start Guide: move subqueries to end

[Copilot]

Subqueries are an advanced topic requiring understanding of basic SELECT, JOINs, and aggregates. Moved from section 3 to section 11 for better learning progression.

Changes

• Section order updated: Subqueries moved from position 3 to 11
• Sections 4-11 renumbered to 3-10
• Table of contents updated in both markdown and HTML versions
• Content unchanged: 100% of subquery examples preserved, only position changed

New structure

1. Create Tables
2. Single Table Query
3. DISTINCT          (was 4)
4. ORDER BY          (was 5)
5. Foreign Key       (was 6)
6. Multi Table       (was 7)
7. Aggregate Fns     (was 8)
8. GROUP BY          (was 9)
9. HAVING            (was 10)
10. Set Operations   (was 11)
11. Subqueries       (was 3) ← moved

Students now learn foundational concepts before encountering nested queries.

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