Point ZTCPP link at mailman listinfo instead of archive browser

Use the mailman3 list page (subscription + info + archive link from
there) so visitors land on the canonical signup destination rather
than the bare archive view.

  https://mailarchive.ietf.org/arch/browse/ztcpp/
    →
  https://mailman3.ietf.org/mailman3/lists/ztcpp.ietf.org/

Applied to all 7 language copies of specification.html.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: windcbf

content/de/specification.html

@@ -172,7 +172,7 @@ <h3 class="spec-table__title">draft-opennhp-ztcpp-nhp</h3>
               </div>
               <div class="spec-row">
                 <span class="spec-row__label">Arbeitsgruppe</span>
-                <span class="spec-row__value"><a href="https://mailarchive.ietf.org/arch/browse/ztcpp/" target="_blank">Zero Trust Control and Policy Protocol (ZTCPP)</a></span>
+                <span class="spec-row__value"><a href="https://mailman3.ietf.org/mailman3/lists/ztcpp.ietf.org/" target="_blank">Zero Trust Control and Policy Protocol (ZTCPP)</a></span>
               </div>
               <div class="spec-row">
                 <span class="spec-row__label">Veröffentlicht</span>

content/en/specification.html

@@ -172,7 +172,7 @@ <h3 class="spec-table__title">draft-opennhp-ztcpp-nhp</h3>
               </div>
               <div class="spec-row">
                 <span class="spec-row__label">Working Group</span>
-                <span class="spec-row__value"><a href="https://mailarchive.ietf.org/arch/browse/ztcpp/" target="_blank">Zero Trust Control and Policy Protocol (ZTCPP)</a></span>
+                <span class="spec-row__value"><a href="https://mailman3.ietf.org/mailman3/lists/ztcpp.ietf.org/" target="_blank">Zero Trust Control and Policy Protocol (ZTCPP)</a></span>
               </div>
               <div class="spec-row">
                 <span class="spec-row__label">Published</span>

content/es/specification.html

@@ -172,7 +172,7 @@ <h3 class="spec-table__title">draft-opennhp-ztcpp-nhp</h3>
               </div>
               <div class="spec-row">
                 <span class="spec-row__label">Grupo de trabajo</span>
-                <span class="spec-row__value"><a href="https://mailarchive.ietf.org/arch/browse/ztcpp/" target="_blank">Zero Trust Control and Policy Protocol (ZTCPP)</a></span>
+                <span class="spec-row__value"><a href="https://mailman3.ietf.org/mailman3/lists/ztcpp.ietf.org/" target="_blank">Zero Trust Control and Policy Protocol (ZTCPP)</a></span>
               </div>
               <div class="spec-row">
                 <span class="spec-row__label">Publicado</span>

content/fr/specification.html

@@ -172,7 +172,7 @@ <h3 class="spec-table__title">draft-opennhp-ztcpp-nhp</h3>
               </div>
               <div class="spec-row">
                 <span class="spec-row__label">Groupe de travail</span>
-                <span class="spec-row__value"><a href="https://mailarchive.ietf.org/arch/browse/ztcpp/" target="_blank">Zero Trust Control and Policy Protocol (ZTCPP)</a></span>
+                <span class="spec-row__value"><a href="https://mailman3.ietf.org/mailman3/lists/ztcpp.ietf.org/" target="_blank">Zero Trust Control and Policy Protocol (ZTCPP)</a></span>
               </div>
               <div class="spec-row">
                 <span class="spec-row__label">Publié le</span>

content/ja/specification.html

@@ -172,7 +172,7 @@ <h3 class="spec-table__title">draft-opennhp-ztcpp-nhp</h3>
               </div>
               <div class="spec-row">
                 <span class="spec-row__label">ワーキンググループ</span>
-                <span class="spec-row__value"><a href="https://mailarchive.ietf.org/arch/browse/ztcpp/" target="_blank">Zero Trust Control and Policy Protocol (ZTCPP)</a></span>
+                <span class="spec-row__value"><a href="https://mailman3.ietf.org/mailman3/lists/ztcpp.ietf.org/" target="_blank">Zero Trust Control and Policy Protocol (ZTCPP)</a></span>
               </div>
               <div class="spec-row">
                 <span class="spec-row__label">公開日</span>

content/zh-cn/specification.html

@@ -166,7 +166,7 @@ <h3 class="spec-table__title">draft-opennhp-ztcpp-nhp</h3>
               </div>
               <div class="spec-row">
                 <span class="spec-row__label">工作组</span>
-                <span class="spec-row__value"><a href="https://mailarchive.ietf.org/arch/browse/ztcpp/" target="_blank">Zero Trust Control and Policy Protocol (ZTCPP)</a></span>
+                <span class="spec-row__value"><a href="https://mailman3.ietf.org/mailman3/lists/ztcpp.ietf.org/" target="_blank">Zero Trust Control and Policy Protocol (ZTCPP)</a></span>
               </div>
               <div class="spec-row">
                 <span class="spec-row__label">发布日期</span>

content/zh-tw/specification.html

@@ -170,7 +170,7 @@ <h3 class="spec-table__title">draft-opennhp-ztcpp-nhp</h3>
               </div>
               <div class="spec-row">
                 <span class="spec-row__label">工作小組</span>
-                <span class="spec-row__value"><a href="https://mailarchive.ietf.org/arch/browse/ztcpp/" target="_blank">Zero Trust Control and Policy Protocol (ZTCPP)</a></span>
+                <span class="spec-row__value"><a href="https://mailman3.ietf.org/mailman3/lists/ztcpp.ietf.org/" target="_blank">Zero Trust Control and Policy Protocol (ZTCPP)</a></span>
               </div>
               <div class="spec-row">
                 <span class="spec-row__label">發布日期</span>