1541468, fixed all links possible.

Author: john-par

docs/index.yml

@@ -163,11 +163,11 @@ additionalContent:
             - text: Web development
               url: /aspnet/
             - text: Azure development and management
-              url: azure/index.yml
+              url: /visualstudio/azure
             - text: Python
-              url: python/index.yml
+              url: /visualstudio/python
             - text: Node.js
-              url: javascript/index.yml
+              url: /visualstudio/javascript
             - text: Data storage and processing
               url: data-tools/index.md
             - text: Data science

mac/2017/asp-net-core.md

@@ -229,7 +229,7 @@ Make sure to complete all four steps successfully to ensure that .NET Core is in
 
 This guide gave an introduction to ASP.NET Core. It describes what it is, when to use it, and provided information on using it in Visual Studio for Mac.
 For more information on the next steps from here, refer to the following guides:
-- [ASP.NET Core](/aspnet/core/?view=aspnetcore-2.1#build-web-ui-and-web-apis-using-aspnet-core-mvc) docs.
+- [ASP.NET Core](/aspnet/core/#build-web-apis-and-web-ui-using-aspnet-core-mvc) docs.
 - [Creating Backend Services for Native Mobile Applications](/aspnet/core/mobile/native-mobile-backend), which shows how to build a REST service using ASP.NET Core for a Xamarin.Forms app.
 - [ASP.NET Core hands-on lab](https://github.com/Microsoft/vs4mac-labs/tree/master/Web/Getting-Started).