Improve the gear menu.

Simplify the menu. We don't/can't list all old releases, it takes too much
room and overflows the screen on mobile. We now have a more useful set,

i18n/en.toml

@@ -43,6 +43,18 @@ other = "Light Theme"
 [dark_theme]
 other = "Dark Theme"
 
+[other_versions_of_site]
+other = "Other versions of this site"
+
+[current_release]
+other = "Current Release (%s)"
+
+[next_release]
+other = "Next Release (Preliminary %s)"
+
+[archived_releases]
+other = "Older Releases"
+
 [options_menu]
 other = "Options and Settings"
 

layouts/partials/header.html

@@ -1,8 +1,5 @@
 {{ $posts := (where .Site.Pages "Section" "blog").ByPublishDate.Reverse }}
 {{ $latest_post := index $posts 0 }}
-{{ $version := .Site.Data.args.version }}
-
-{{/* TODO: Need to set the specialized targets for the dropdown menu versions */}}
 
 <header>
     <nav class="navbar navbar-expand-md navbar-dark fixed-top bg-dark justify-content-between">
@@ -60,12 +57,6 @@
                     </a>
 
                     <div class="dropdown-menu dropdown-menu-right" aria-labelledby="gearDropdown">
-                        {{ range $rel := .Site.Data.releases }}
-                            <a href="{{ $rel.url }}" class="dropdown-item {{ if eq $version $rel.name }}active{{ end }}">{{ $rel.name }}</a>
-                        {{ end }}
-
-                        <div class="dropdown-divider"></div>
-
                         <a lang="en" href="/" class="dropdown-item {{ if eq $home.Lang "en" }}active{{ end }}">English</a>
                         <a lang="zh" href="/zh" class="dropdown-item {{ if eq $home.Lang "zh" }}active{{ end }}">中文</a>
 
@@ -83,6 +74,25 @@
                                 <a class="dropdown-item" href="https://github.com/istio/istio.github.io/edit/master/content/{{ .Path }}">{{ i18n "edit_on_github" }}</a>
                             {{ end }}
                         {{ end }}
+
+                        <div class="dropdown-divider"></div>
+
+                        <h6 class="dropdown-header">{{ i18n "other_versions_of_site" }}</h6>
+
+                        {{ $next := index .Site.Data.releases 0 }}
+                        {{ $current := index .Site.Data.releases 1 }}
+
+                        {{ if .Site.Data.args.archive }}
+                            <a href="https://istio.io" class="dropdown-item">{{ printf (i18n "current_release") $current.name }}</a>
+                            <a href="https://preliminary.istio.io" class="dropdown-item">{{ printf (i18n "next_release") $next.name }}</a>
+                            <a href="https://archive.istio.io" class="dropdown-item">{{ i18n "archived_releases" }}</a>
+                        {{ else if .Site.Data.args.preliminary }}
+                            <a href="https://istio.io" class="dropdown-item">{{ printf (i18n "current_release") $current.name }}</a>
+                            <a href="https://archive.istio.io" class="dropdown-item">{{ i18n "archived_releases" }}</a>
+                        {{ else }}
+                            <a href="https://preliminary.istio.io" class="dropdown-item">{{ printf (i18n "next_release") $next.name }}</a>
+                            <a href="https://archive.istio.io" class="dropdown-item">{{ i18n "archived_releases" }}</a>
+                        {{ end }}
                     </div>
                 </li>