📝 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/front-matter/index.de.md

@@ -1,5 +1,6 @@
 ---
 title: "Front Matter"
+featureimage: "images/v3/front-matter.png"
 weight: 7
 draft: false
 description: "Alle in Blowfish verfügbaren Front-Matter-Variablen."

exampleSite/content/docs/front-matter/index.es.md

@@ -1,5 +1,6 @@
 ---
 title: "Front Matter"
+featureimage: "images/v3/front-matter.png"
 weight: 7
 draft: false
 description: "Todas las variables de front matter disponibles en Blowfish."

exampleSite/content/docs/front-matter/index.fr.md

@@ -1,5 +1,6 @@
 ---
 title: "Front Matter"
+featureimage: "images/v3/front-matter.png"
 weight: 7
 draft: false
 description: "Toutes les variables front matter disponibles dans Blowfish."

exampleSite/content/docs/front-matter/index.it.md

@@ -1,5 +1,6 @@
 ---
 title: "Front Matter"
+featureimage: "images/v3/front-matter.png"
 weight: 7
 draft: false
 description: "Tutte le variabili in primo piano disponibili in Blowfish."

exampleSite/content/docs/front-matter/index.ja.md

@@ -1,5 +1,6 @@
 ---
 title: "フロントマター"
+featureimage: "images/v3/front-matter.png"
 weight: 7
 draft: false
 description: "Blowfish で利用可能なすべてのフロントマター変数。"

exampleSite/content/docs/front-matter/index.pt-br.md

@@ -1,5 +1,6 @@
 ---
 title: "Front Matter"
+featureimage: "images/v3/front-matter.png"
 weight: 7
 draft: false
 description: "Todas as variáveis de front matter disponíveis no Blowfish."

exampleSite/content/docs/front-matter/index.pt-pt.md

@@ -1,5 +1,6 @@
 ---
 title: "Front Matter"
+featureimage: "images/v3/front-matter.png"
 weight: 7
 draft: false
 description: "Todas as variáveis de front matter disponíveis no Blowfish."

exampleSite/content/docs/front-matter/index.zh-cn.md

@@ -1,5 +1,6 @@
 ---
 title: "Front Matter(文件头信息)"
+featureimage: "images/v3/front-matter.png"
 weight: 7
 draft: false
 description: "文本主要介绍 Blowfish 中页面中可以添加的所有的 Front Matter 参数。"