Add LocallyGrown series part 6 and implement series navigation

- Add final part of LocallyGrown.net series: "From Survival to Sustainability"
- Implement Hugo series taxonomy for better content organization
- Add series navigation partial showing all 6 parts with prev/next links
- Update all LocallyGrown posts with series metadata and ordering
- Display series indicators on index page for connected content
- Style series navigation with responsive design and dark mode support
- Fix series links across all posts to use correct slugs

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

content/posts/2025-09-22-lessons-from-the-solo-developer-trenches.md

@@ -22,6 +22,8 @@ keywords:
   - rails
   - claude
 slug: locallygrown-lessons
+series: ["LocallyGrown.net: The 23-Year Journey"]
+series_order: 5
 ---
 
 _Advanced Developer Tools, Real Tradeoffs_
@@ -1177,4 +1179,4 @@ _This is part five of a series documenting the rescue and modernization of Local
 3. [The Architecture Challenge: Translating 19 Years of Rails Logic to Modern SvelteKit](https://blog.kestrelsnest.social/posts/locallygrown-architecture-challenge/)
 4. [The Reality of Production: When Hope Meets Live Users](https://blog.kestrelsnest.social/posts/locallygrown-reality-of-production/)
 5. **Lessons from the Solo Developer Using Modern Tools** ← _You are here_
-6. The Future: Building on Modern Foundations
+6. [From Survival to Sustainability: The Next 20 Years for LocallyGrown.net](https://blog.kestrelsnest.social/posts/locallygrown-survival-to-sustainability/)