Move installer script to ./installer directory

src/DesktopMagic.Installer/DesktopMagic.Installer.csproj

@@ -1,23 +0,0 @@
-<Project Sdk="Microsoft.NET.Sdk">
-
-  <PropertyGroup>
-    <TargetFramework>net5.0</TargetFramework>
-    <RunPostBuildEvent>Always</RunPostBuildEvent>
-  </PropertyGroup>
-
-  <ItemGroup>
-    <Compile Remove="Inno\**" />
-    <EmbeddedResource Remove="Inno\**" />
-    <None Remove="Inno\**" />
-  </ItemGroup>
-
-  <ItemGroup>
-    <None Update="Installer.iss">
-      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
-    </None>
-  </ItemGroup>
-
-  <Target Name="PostBuild" AfterTargets="PostBuildEvent">
-    <Exec Command="&quot;$(ProjectDir)Inno\ISCC.exe&quot; &quot;$(ProjectDir)Installer.iss&quot;" />
-  </Target>
-</Project>