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>

layouts/_default/list.html

@@ -5,6 +5,14 @@
       {{ range where .Paginator.Pages "Type" "!=" "page" }}
         <li class="posts-list-item">
           <a class="posts-list-item-title" href="{{ .Permalink }}">{{ .Title }}</a>
+          {{ if .Params.series }}
+            {{ $series := index .Params.series 0 }}
+            {{ $order := .Params.series_order }}
+            <span class="series-indicator">
+              {{ partial "icon.html" (dict "ctx" $ "name" "book") }}
+              Part {{ $order }} of {{ $series }}
+            </span>
+          {{ end }}
           <span class="posts-list-item-description">
             <div>
               {{ if .Description }}