navigation: move "security advisories" to a top-level entry

While security advisories are important to inform development, they are most useful to users. As
such having the page under the "development" dropdown next to information about contributing to the
project is confusing and makes the page harder to find for people we'd like to reach.

Author: darosior

_data/navigation.yml

@@ -15,6 +15,9 @@ en:
   releases:
     title: "releases"
     url:   "/en/releases/"
+  security-advisories:
+    title: "Security Advisories"
+    url:   "/en/security-advisories/"
   dev:
     title: "Development"
     submenu: true
@@ -31,9 +34,6 @@ en:
       eol:
         title: "Lifecycle"
         url:   "/en/lifecycle"
-      security-advisories:
-        title: "Security Advisories"
-        url:   "/en/security-advisories/"
   contact:
     title: "Contact"
     submenu: true
@@ -60,6 +60,9 @@ zh_CN:
   releases:
     title: "软件发行"
     url:   "/zh_CN/releases/"
+  security-advisories:
+    title: "Security Advisories"
+    url:   "/en/security-advisories/"
   dev:
     title: "开发"
     submenu: true
@@ -79,9 +82,6 @@ zh_CN:
       eol:
         title: "生命周期"
         url:   "/zh_CN/lifecycle/"
-      security-advisories:
-        title: "Security Advisories"
-        url:   "/en/security-advisories/"
   contact:
     title: "联系"
     submenu: true
@@ -105,6 +105,9 @@ zh_TW:
   releases:
     title: "軟件發行"
     url:   "/zh_TW/releases/"
+  security-advisories:
+    title: "Security Advisories"
+    url:   "/en/security-advisories/"
   dev:
     title: "Development"
     submenu: true
@@ -121,9 +124,6 @@ zh_TW:
       eol:
         title: "Lifecycle"
         url:   "/en/lifecycle/"
-      security-advisories:
-        title: "Security Advisories"
-        url:   "/en/security-advisories/"
   contact:
     title: "Contact"
     submenu: true
@@ -150,6 +150,9 @@ ja:
   releases:
     title: "リリース"
     url:   "/ja/releases/"
+  security-advisories:
+    title: "セキュリティアドバイザリ"
+    url:   "/ja/security-advisories/"
   dev:
     title: "開発"
     submenu: true
@@ -166,9 +169,6 @@ ja:
       eol:
         title: "ライフサイクル"
         url:   "/ja/lifecycle"
-      security-advisories:
-        title: "セキュリティアドバイザリ"
-        url:   "/ja/security-advisories/"
   contact:
     title: "コンタクト"
     submenu: true
@@ -198,6 +198,9 @@ es:
   releases:
     title: "Versiones"
     url:   "/es/releases/"
+  security-advisories:
+    title: "Security Advisories"
+    url:   "/en/security-advisories/"
   dev:
     title: "Development"  # XXX
     submenu: true
@@ -214,9 +217,6 @@ es:
       eol:
         title: "Lifecycle"  # XXX
         url:   "/en/lifecycle"  # XXX
-      security-advisories:
-        title: "Security Advisories"
-        url:   "/en/security-advisories/"
   contact:
     title: "Contact"  # XXX
     submenu: true