Android guidelines restructuring (#2324)

* Merged Android's introduction.md with design.md and removed a reference to the former from general_sidebar.yml

* Updated implementation.md to follow the new guidelines structure.

* Updated design.md with PR suggestions

* Updated design.md and implementation.md with PR suggestions. Added a couple links to refs.md

* Added more changes from PR feedback.

* Changes reference in includes_/refs.md from introduction.md to design.md for Android.

* Removed a point about sync streaming methods based on PR feedback.

* Changed the reference to the Android Guidelines entry point wherever required.

README.md

@@ -50,7 +50,7 @@ contact [[email protected]](mailto:[email protected]) with any additio
 [![Github.io linkchecker](https://img.shields.io/azure-devops/build/azure-sdk/internal/1620?label=github.io%20linkchecker)](https://dev.azure.com/azure-sdk/internal/_build/latest?definitionId=1620&branchName=master)
 
 [General Design Guidelines]: https://azure.github.io/azure-sdk/general_introduction.html
-[Design Guidelines for Android]: https://azure.github.io/azure-sdk/android_introduction.html
+[Design Guidelines for Android]: https://azure.github.io/azure-sdk/android_design.html
 [Design Guidelines for .NET]: https://azure.github.io/azure-sdk/dotnet_introduction.html
 [Design Guidelines for Go]: https://azure.github.io/azure-sdk/golang_introduction.html
 [Design Guidelines for C99]: https://azure.github.io/azure-sdk/clang_design.html

_data/sidebars/general_sidebar.yml

@@ -125,14 +125,10 @@ entries:
               external_url: https://azure.github.io/azure-sdk-for-js/storage.html#azure-storage-queue
   - title: Android Guidelines
     folderitems:
-      - title: Introduction
-        url: /android_introduction.html
-      - title: API Design
+      - title: Design
         url: /android_design.html
       - title: Implementation
         url: /android_implementation.html
-      - title: Documentation
-        url: /android_documentation.html
   - title: iOS Guidelines
     folderitems:
       - title: Design

_data/topnav.yml

@@ -15,7 +15,7 @@ topnav_dropdowns:
             - title: General
               url: /general_introduction.html
             - title: Android (Draft)
-              url: /android_introduction.html
+              url: /android_design.html
             - title: C (Draft)
               url: /clang_design.html
             - title: C++ (Draft)

_includes/refs.md

@@ -7,7 +7,7 @@
 [rest-lro]: https://github.com/microsoft/api-guidelines/blob/vNext/Guidelines.md#13-long-running-operations
 
 [general-guidelines]: {{ site.baseurl }}{% link docs/general/introduction.md %}
-[android-guidelines]: {{ site.baseurl }}{% link docs/android/introduction.md %}
+[android-guidelines]: {{ site.baseurl }}{% link docs/android/design.md %}
 [clang-guidelines]: {{ site.baseurl }}{% link docs/clang/design.md %}
 [cpp-guidelines]: {{ site.baseurl }}{% link docs/cpp/introduction.md %}
 [dotnet-guidelines]: {{ site.baseurl }}{% link docs/dotnet/introduction.md %}