Change Sass Builder NuGet package to AspNetCore.SassCompiler

[CalebABG]

This provides a working solution for Apple Silicon machines to build the Web project.

The previous NuGet package: LibSassBuilder has an open issue for support of M1 Macs running into issues with the MSBuild Target complaining about not being able to run the command to compile the Sass files - johan-v-r/LibSassBuilder#42

Not quite sure if the compilerconfig.json files are still needed, so I left them as is.

[SakuraIsayeki]

Usually I never approve a library change on PR, unless there's good reasons to match. Here it's the sheer deprecation of the LibSassCompiler that just ticks the box, no questions asked. Just about anything will perform better than this, provided the same conditions of course.

Also yep, you can remove the compilerconfig.json, as it's a vestige of the time where WOWS Karma used Webcompiler as its SASS/SCSS compiler ;)