Create docs/platforms, relocate android & web pages (#473)

Closes #472

config.yaml

@@ -101,6 +101,10 @@ menu:
       url: /docs/languages/
       weight: 2
       parent: docs
+    - name: Platforms
+      url: /docs/platforms/
+      weight: 2
+      parent: docs
     - name: Guides
       url: /docs/guides/
       identifier: guides

content/about.md

@@ -50,5 +50,5 @@ Principles](/blog/principles/) on the [gRPC blog](/blog/).
   <a name="officially-supported-languages-and-platforms"></a>
 
   Our table of **officially supported languages and platforms** has moved!
-  See [Supported languages and platforms](/docs/languages/#official-support).
+  See [Official support](/docs/#official-support).
 {{< /note >}}

content/docs/_index.md

@@ -3,7 +3,7 @@ title: Documentation
 ---
 
 Learn about key gRPC concepts, try a quick start, find tutorials and reference
-material for all [supported languages](languages/).
+material for all supported [languages][] and [platforms][]:
 
 - **New to gRPC?** Start with the following pages:
 
@@ -13,11 +13,22 @@ material for all [supported languages](languages/).
 
 - **Eager to see gRPC in action?**
 
-  [Select a language](languages/) and then choose its **Quick start**.
+  Select a [language][] or [platform][], then choose its **Quick start**.
 
 - Interested in **gRPC feature details?**
 
   Try one of the following:
 
-  - [Select a language](languages/) and then choose **Tutorial** or **API reference**
+  - Select a [language][] or [platform][], then choose **Tutorial** or **API reference**
   - [Guides](guides/)
+
+### Official support
+
+These are the officially supported gRPC language, platform and OS versions:
+
+{{< supported-platforms >}}
+
+[language]: {{< ref "languages" >}}
+[languages]: {{< ref "languages" >}}
+[platform]: {{< ref "platforms" >}}
+[platforms]: {{< ref "platforms" >}}

content/docs/languages/_index.md

@@ -1,11 +1,11 @@
 ---
-title: Supported languages and platforms
+title: Supported languages
 short: Languages
 weight: 2
 nav_children: section
 ---
 
-Each gRPC language / platform has links to the following pages and more:
+Each gRPC language / [platform][] has links to the following pages and more:
 
 - Quick start
 - Tutorials
@@ -13,7 +13,6 @@ Each gRPC language / platform has links to the following pages and more:
 
 Select a language to get started:
 
-- [Android Java](android/)
 - [C# / .NET](csharp/)
 - [C++](cpp/)
 - [Dart](dart/)
@@ -25,10 +24,5 @@ Select a language to get started:
 - [PHP](php/)
 - [Python](python/)
 - [Ruby](ruby/)
-- [Web](web/)
 
-### Official support
-
-These are the officially supported gRPC language, platform and OS versions:
-
-{{< supported-platforms >}}
+[platform]: {{< relref "platforms" >}}

content/docs/platforms/_index.md

@@ -0,0 +1,20 @@
+---
+title: Supported platforms
+short: Platforms
+weight: 2
+nav_children: section
+---
+
+Each gRPC [language][] / platform has links to the following pages and more:
+
+- Quick start
+- Tutorials
+- API reference
+
+Select a platform to get started:
+
+- [Android Java](android/)
+- iOS (coming soon)
+- [Web](web/)
+
+[language]: {{< ref "languages" >}}

layouts/_default/_markup/render-link.html

@@ -1,4 +1,4 @@
-{{ $isRedirected := findRE "^(|../|/docs/languages/.+?/)(api|daily-builds)(/.*)?(\\?.*)?$" .Destination -}}
+{{ $isRedirected := findRE "^(|../|/docs/(languages|platforms)/.+?/)(api|daily-builds)(/.*)?(\\?.*)?$" .Destination -}}
 {{ $isExternal := or (hasPrefix .Destination "http") $isRedirected -}}
 <a href="{{ .Destination | safeURL }}"
   {{- with .Title }} title="{{ . }}"{{ end -}}

layouts/index.redirects

@@ -1,5 +1,10 @@
 # cSpell:ignore channelz helloasync loadbalancing quickstart sapi vendasta vendastagrpc
-#
+
+# Languages -> platforms redirects
+
+/docs/languages/android/*  /docs/platforms/android/:splat
+/docs/languages/web/*  /docs/platforms/web/:splat
+
 # API reference docs
 #
 # Redirects are handled as if by the following rules (let $api_path be the
@@ -9,7 +14,9 @@
 #  /docs/languages/:lang/api  $api_path 301!                          # when $api_path starts with 'http'
 #  /docs/languages/:lang/api  https://grpc.github.io/$api_path 301!   # otherwise; 'LANG' in $api_path is replaced by :lang
 
-{{ range (.Site.GetPage "/docs/languages").Sections -}}
+{{ $pages := (.Site.GetPage "/docs/platforms").Sections -}}
+{{ $pages := $pages | union (.Site.GetPage "/docs/languages").Sections -}}
+{{ range $pages -}}
   {{ $from_path := printf "/%sapi" .File.Dir -}}
 
   {{ $api_path := .Params.api_path | default "grpc/LANG" -}}

layouts/partials/nav.html

@@ -60,7 +60,7 @@
           <ul class="nav-section-links" x-show="open">
             {{ range $children -}}
               {{ $isActive := eq $here .RelPermalink -}}
-              {{ $isRedirected :=  findRE "^/docs/languages/.+?/(api|daily-builds)(/.*)?$" .RelPermalink -}}
+              {{ $isRedirected :=  findRE "^/docs/(languages|platforms)/.+?/(api|daily-builds)(/.*)?$" .RelPermalink -}}
               {{ $isExternal := or (hasPrefix .RelPermalink "http") $isRedirected -}}
               <li class="nav-section-link{{ if $isActive }} is-active{{ end }}">
                 <a href="{{ .RelPermalink }}"