feat(articles): "About the Author" section sourced from profiles (#29)

## What

Adds an **About the Author** section to the bottom of article and
podcast pages, sourced from the author's profile (the taxonomy term
content file introduced in #27).

> **Stacked on #27** (`feat/author-profiles`). Review/merge that first;
this PR's base is `feat/author-profiles`, so the diff here is just the
article section.

## Behavior

- For each author credited in `authors:` who has **opted into a
profile**, renders a card with avatar, preferred name, tagline, bio,
social links, and a "View profile" link.
- Articles whose authors have **no profile** are unchanged — no empty
section.
- Co-authored posts show a card per enriched author (heading
pluralizes); un-enriched co-authors are simply omitted.
- Reuses the `author-avatar` and `author-links` partials from #27.

## Cleanup

Replaces the legacy per-article `author_bio` front-matter block — which
**0 articles** used and which rendered a generic placeholder icon — with
the profile-sourced partial.

## Testing

- `hugo` builds clean.
- Verified on a podcast episode crediting an enriched author (Gilbert
Sanchez): the section renders with the Gravatar, tagline, bio,
Mastodon/LinkedIn icons, and profile link.
- Verified an article by an un-enriched author renders **no** About
section.
- Verified an episode that only name-drops an author in the title (not
in `authors:`) gets no section.

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

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

Author: HeyItsGilbert

themes/powershell-community/layouts/_default/single.html

@@ -118,22 +118,8 @@ <h3 class="text-lg font-semibold text-gray-900 mb-3">Tags</h3>
         </div>
         {{ end }}
 
-        <!-- Author Bio (if available) -->
-        {{ with .Params.author_bio }}
-        <div class="mt-6 pt-6 border-t border-gray-200">
-            <div class="bg-gray-50 rounded-xl p-6">
-                <div class="flex items-start space-x-4">
-                    <div class="w-16 h-16 bg-blue-600 rounded-full flex items-center justify-center">
-                        <i class="fas fa-user text-white text-xl"></i>
-                    </div>
-                    <div class="flex-1">
-                        <h3 class="text-lg font-semibold text-gray-900 mb-2">About <a href="{{ "/authors/" | relURL }}{{ $.Params.author | urlize }}/" class="hover:text-blue-600 transition-colors duration-200">{{ $.Params.author }}</a></h3>
-                        <p class="text-gray-600">{{ . }}</p>
-                    </div>
-                </div>
-            </div>
-        </div>
-        {{ end }}
+        <!-- About the Author (sourced from author profiles) -->
+        {{ partial "article-author-about.html" . }}
 
         <!-- Related Posts -->
         {{ $related := .Site.RegularPages.Related . | first 3 }}

themes/powershell-community/layouts/partials/article-author-about.html

@@ -0,0 +1,37 @@
+{{- /*
+  "About the Author" section for article/single pages, sourced from each credited
+  author's profile (taxonomy term content file). Renders only for authors who have
+  opted into a profile, so articles by un-enriched authors are unchanged.
+*/ -}}
+{{- $enriched := slice -}}
+{{- with .GetTerms "authors" -}}
+  {{- range . -}}
+    {{- if .File -}}{{- $enriched = $enriched | append . -}}{{- end -}}
+  {{- end -}}
+{{- end -}}
+{{- with $enriched -}}
+<div class="mt-8 pt-6 border-t border-gray-200">
+  <h3 class="text-lg font-semibold text-gray-900 mb-4">About the Author{{ if gt (len .) 1 }}s{{ end }}</h3>
+  <div class="space-y-4">
+    {{- range . -}}
+    {{- $display := .Title -}}{{- with .Params.preferred_name -}}{{- $display = . -}}{{- end -}}
+    <div class="bg-gray-50 rounded-xl p-6">
+      <div class="flex items-start gap-4">
+        {{ partial "author-avatar.html" (dict "page" . "name" .Title "size" 96 "class" "w-16 h-16 rounded-full object-cover ring-2 ring-blue-100 shrink-0") }}
+        <div class="flex-1 min-w-0">
+          <h4 class="text-lg font-semibold text-gray-900">
+            <a href="{{ .RelPermalink }}" class="hover:text-blue-600 transition-colors duration-200">{{ $display }}</a>
+          </h4>
+          {{ with .Params.tagline }}<p class="text-sm text-gray-500 mb-2">{{ . }}</p>{{ end }}
+          {{ with .Content }}<div class="prose prose-sm max-w-none text-gray-600">{{ . }}</div>{{ end }}
+          {{ partial "author-links.html" (dict "page" . "class" "flex gap-4 text-lg mt-3") }}
+          <a href="{{ .RelPermalink }}" class="inline-flex items-center text-sm font-medium text-blue-600 hover:text-blue-700 mt-3">
+            View profile<i class="fas fa-arrow-right ml-2"></i>
+          </a>
+        </div>
+      </div>
+    </div>
+    {{- end -}}
+  </div>
+</div>
+{{- end -}}