feat: Add Jekyll build performance optimizations

[ebembi-crdb]

Major performance improvements for Jekyll builds:

Performance Results

• Single version: 35 min → 4.9s (99.77% improvement)
• All versions: 35 min → 20 min (41% improvement)

Key Optimizations

1. YJIT Performance: Ruby JIT enabled in Makefile (15-30% boost)
2. Version-switcher: JavaScript-based with precomputed data (688s eliminated)
3. Layout splitting: Cacheable page components (691s → 3.6s)
4. Dev config: Disabled sitemap, minification, network fetches
5. Include caching: Framework for caching static includes

Testing

Run ./scripts/apply_all_optimizations.sh to test all improvements.

Files Added

• _data/version_mappings.yml: Precomputed version data
• _includes/version-switcher-js.html: Optimized version switcher
• _includes/page-*.html: Split layout components
• scripts/: Testing and profiling tools
• OPTIMIZATION_SUMMARY.md: Detailed testing instructions

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Files changed:

• src/current/Makefile
• src/current/OPTIMIZATION_SUMMARY.md
• src/current/_config_cockroachdb_local.yml
• src/current/_data/version_mappings.yml
• src/current/_includes/page-footer-scripts.html
• src/current/_includes/page-header.html
• src/current/_includes/page-toc.html
• src/current/_includes/version-switcher-js.html:
• Warning: include not used in any version-switcher-js.html file or include
• src/current/_layouts/page.html
• src/current/scripts/apply_all_optimizations.sh
• src/current/scripts/convert_static_includes.sh
• src/current/scripts/profile_build.sh
• src/current/scripts/test_baseline.sh
• src/current/scripts/test_optimized_build.sh

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