feat: Add comprehensive migration guide from manual Borsh to LUMOS

- Created detailed step-by-step migration guide in /guides
- Includes 10-step migration process with real-world examples
- Binary compatibility verification tests (critical for safety)
- Before/after code comparisons for common patterns
- 3 rollout strategies: Big Bang, Incremental, Shadow Deployment
- Troubleshooting section for 5+ common issues
- TypeScript SDK migration instructions
- CI/CD automation setup
- Rollback plan for emergency situations
- Migration checklist template for tracking progress

Coverage:
- Simple structs, enums (unit/tuple/struct variants)
- Option fields, Vec types, nested structures
- Anchor integration (#[account] macro)
- TypeScript Borsh schema synchronization
- Testing strategies and success metrics

Closes #14 - Migration Guide

Real-world example: NFT Marketplace (15 types, 800 → 200 LOC)

Author: rz1989s

astro.config.mjs

@@ -58,16 +58,12 @@ export default defineConfig({
 						{ label: 'Generated Code', slug: 'api/generated-code' },
 					],
 				},
-				// TODO: Add these sections as we create the content
-				// {
-				// 	label: 'Guides',
-				// 	items: [
-				// 		{ label: 'Type Mapping', slug: 'guides/type-mapping' },
-				// 		{ label: 'Anchor Integration', slug: 'guides/anchor-integration' },
-				// 		{ label: 'Enum Support', slug: 'guides/enum-support' },
-				// 		{ label: 'Migration Guide', slug: 'guides/migration-guide' },
-				// 	],
-				// },
+				{
+					label: 'Guides',
+					items: [
+						{ label: 'Migration Guide', slug: 'guides/migration-guide' },
+					],
+				},
 				// {
 				// 	label: 'Examples',
 				// 	items: [