Remove fixing-warnings.md and link to dotnet/docs (#2645)

Author: jtschuster

docs/README.md

@@ -2,6 +2,9 @@
 
 This folder includes several documents that explain both high-level and low-level concepts about the IL trimmer and related tools.
 
+## Official Docs
+View the official trimming docs at [docs.microsoft.com](https://docs.microsoft.com/en-us/dotnet/core/deploying/trimming/trim-self-contained)
+
 ## Usage Docs
 - [MSBuild Integration](illink-tasks.md)
 - [Available Command Line Options](illink-options.md)