Remove AppVeyor build

Author: loop8ack

ExtensionManager.sln

@@ -12,7 +12,6 @@ EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution Items", "{AF4F860B-CBFE-4136-BFA4-4B51B64FC796}"
 	ProjectSection(SolutionItems) = preProject
 		.editorconfig = .editorconfig
-		appveyor.yml = appveyor.yml
 		README.md = README.md
 	EndProjectSection
 EndProject

README.md

@@ -4,7 +4,7 @@
 [![](https://img.shields.io/github/actions/workflow/status/loop8ack/ExtensionPackTools/Build.yml?branch=master&label=Build%20Status)](https://github.com/loop8ack/ExtensionPackTools/actions/workflows/Build.yml)
 [![](https://img.shields.io/github/actions/workflow/status/loop8ack/ExtensionPackTools/Release.yml?branch=master&label=Latest%20Release)](https://github.com/loop8ack/ExtensionPackTools/releases/latest)
 
-Download the extension from the [Visual Studio Marketplace](https://marketplace.visualstudio.com/items?itemName=Loop8ack.ExtensionManager2022) or get the latest CI build: [VS 2017](http://vsixgallery.com/extension/e83d71b8-8bfc-4e06-b145-b0388910c016/), [VS 2019](http://vsixgallery.com/extension/4a196712-2c3f-4730-ad1d-e7cda4185eb2/), [VS 2022](http://vsixgallery.com/extension/4a196712-2c3f-4730-ad1d-e7cda4185eb3/)
+Download the extension from the [Visual Studio Marketplace](https://marketplace.visualstudio.com/items?itemName=Loop8ack.ExtensionManager2022).
 
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