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/single.html

@@ -0,0 +1,40 @@
+{{ define "main" }}
+  <article class="post">
+    <header class="post-header">
+      <h1 class ="post-title">{{ .Title }}</h1>
+      {{- if ne .Type "page" }}
+      <div class="post-meta">
+        <div>
+          {{ partial "icon.html" (dict "ctx" $ "name" "calendar") }}
+          {{ .PublishDate.Format "Jan 2, 2006" }}
+        </div>
+        <div>
+          {{ partial "icon.html" (dict "ctx" $ "name" "clock") }}
+          {{ .ReadingTime }} min read
+        </div>
+        {{- with .Params.tags }}
+        <div>
+          {{ partial "icon.html" (dict "ctx" $ "name" "tag") }}
+          {{- range . -}}
+            {{ with $.Site.GetPage (printf "/%s/%s" "tags" . ) }}
+              <a class="tag" href="{{ .RelPermalink }}">{{ .Title }}</a>
+            {{- end }}
+          {{- end }}
+        </div>
+        {{- end }}
+      </div>
+      {{- end }}
+    </header>
+
+    <div class="post-content">
+      {{ .Content }}
+    </div>
+
+    {{/* Series navigation at the bottom of the post */}}
+    {{ partial "series.html" . }}
+
+    <div class="post-footer">
+      {{ template "_internal/disqus.html" . }}
+    </div>
+  </article>
+{{ end }}