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>

config.toml

@@ -2,6 +2,11 @@ baseURL = 'https://blog.kestrelsnest.social'
 languageCode = 'en-us'
 title = "Kestrel's Nest"
 theme = "m10c"
+
+[taxonomies]
+  tag = "tags"
+  category = "categories"
+  series = "series"
 [params]
   author = "Eric Wagoner"
   avatar = "face.jpg"