fix: Remove redundant H1 headings from all documentation pages

- Fixed CLI Commands, Type System, Attributes, Generated Code, Migration Guide
- All pages had redundant H1 heading after frontmatter title
- Starlight automatically renders frontmatter title as H1
- Ensures consistent page heading display across entire docs site

Author: rz1989s

src/content/docs/api/attributes.md

@@ -3,8 +3,6 @@ title: Attributes
 description: Reference for all LUMOS schema attributes
 ---
 
-# Attributes Reference
-
 Attributes control how LUMOS generates code for structs and enums. They are written with `#[attribute_name]` syntax above type definitions.
 
 ##  Overview

src/content/docs/api/cli-commands.md

@@ -3,8 +3,6 @@ title: CLI Commands
 description: Complete reference for all LUMOS CLI commands
 ---
 
-# CLI Commands Reference
-
 The LUMOS CLI (`lumos`) provides four main commands for working with `.lumos` schema files.
 
 ## Installation

src/content/docs/api/generated-code.md

@@ -3,8 +3,6 @@ title: Generated Code Examples
 description: See exactly what LUMOS generates from your schemas
 ---
 
-# Generated Code Examples
-
 This page shows complete examples of what LUMOS generates from `.lumos` schemas. Each example includes the input schema and both Rust and TypeScript outputs.
 
 ---

src/content/docs/api/types.md

@@ -3,8 +3,6 @@ title: Type System
 description: Complete reference for all supported types in LUMOS schemas
 ---
 
-# Type System Reference
-
 LUMOS supports a rich type system that maps cleanly between Rust and TypeScript.
 
 ## Type Mapping Overview

src/content/docs/guides/migration-guide.md

@@ -3,8 +3,6 @@ title: Migration Guide
 description: Step-by-step guide for migrating from manual Borsh code to LUMOS
 ---
 
-# Migration Guide: Manual Borsh → LUMOS
-
 This guide helps you transition from hand-written Borsh serialization code to LUMOS-generated schemas.
 
 **Migration time:** 5-30 minutes per struct/enum (depending on complexity)