📝 Sync v3 docs and content across all nine languages

New shortcode sections, landing layout docs, agent skill sections,
v2→v3 upgrade instructions, translated homepages, and sample
article feature images.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

exampleSite/content/docs/thumbnails/index.de.md

@@ -1,5 +1,6 @@
 ---
 title: "Vorschaubilder"
+featureimage: "images/v3/thumbnails.png"
 weight: 10
 draft: false
 description: "Aktivieren Sie Vorschaubilder für Ihre Artikel."

exampleSite/content/docs/thumbnails/index.es.md

@@ -1,5 +1,6 @@
 ---
 title: "Miniaturas"
+featureimage: "images/v3/thumbnails.png"
 weight: 10
 draft: false
 description: "Activa las miniaturas para tus artículos."

exampleSite/content/docs/thumbnails/index.fr.md

@@ -1,5 +1,6 @@
 ---
 title: "Vignettes"
+featureimage: "images/v3/thumbnails.png"
 weight: 10
 draft: false
 description: "Activez les vignettes pour vos articles."

exampleSite/content/docs/thumbnails/index.it.md

@@ -1,5 +1,6 @@
 ---
 title: "Thumbnails"
+featureimage: "images/v3/thumbnails.png"
 weight: 10
 draft: false
 description: "Turn on thumbnails for your articles."

exampleSite/content/docs/thumbnails/index.ja.md

@@ -1,5 +1,6 @@
 ---
 title: "サムネイル"
+featureimage: "images/v3/thumbnails.png"
 weight: 10
 draft: false
 description: "記事にサムネイル画像を設定する。"

exampleSite/content/docs/thumbnails/index.pt-br.md

@@ -1,5 +1,6 @@
 ---
 title: "Miniaturas"
+featureimage: "images/v3/thumbnails.png"
 weight: 10
 draft: false
 description: "Ative miniaturas para seus artigos."

exampleSite/content/docs/thumbnails/index.pt-pt.md

@@ -1,5 +1,6 @@
 ---
 title: "Miniaturas"
+featureimage: "images/v3/thumbnails.png"
 weight: 10
 draft: false
 description: "Ative miniaturas para os seus artigos."

exampleSite/content/docs/thumbnails/index.zh-cn.md

@@ -1,5 +1,6 @@
 ---
 title: "缩略图"
+featureimage: "images/v3/thumbnails.png"
 weight: 10
 draft: false
 description: "为你的文章配置缩略图。"