Feat: render merch CTA on article and home pages

Co-authored-by: Opus 5 <noreply@anthropic.com>

scripts/lib/renderers.mjs

@@ -1,5 +1,5 @@
 import { SITE_URL } from "./constants.mjs";
-import { footer, nav, shellHead } from "./templates.mjs";
+import { footer, merch, nav, shellHead } from "./templates.mjs";
 import { escapeHtml, escapeXml, fmtDate, renderAuthorInline, toISODate } from "./utils.mjs";
 
 export const renderHome = (articles) => `
@@ -48,6 +48,8 @@ ${nav}
         .join("")}
     </div>
   </section>
+
+  ${merch}
 </main>
 ${footer}
 `;
@@ -76,6 +78,8 @@ ${nav}
     </div>
   </article>
 
+  ${merch}
+
   <div class="mt-8">
     <a href="/" class="inline-flex items-center gap-2 text-sm">
       <i data-lucide="arrow-left" class="h-4 w-4"></i> Back to Home
@@ -168,6 +172,8 @@ ${nav}
     </form>
   </article>
 
+  ${merch}
+
   <div class="mt-8">
     <a href="/" class="inline-flex items-center gap-2 text-sm">
       <i data-lucide="arrow-left" class="h-4 w-4"></i> Back to Home