refactor: update project references and remove obsolete solution file

.vscode/tasks.json

@@ -7,7 +7,7 @@
             "type": "process",
             "args": [
                 "build",
-                "${workspaceFolder}/Duempelkas.slnx"
+                "${workspaceFolder}/src/Duempelkas.Desktop/Duempelkas.Desktop.csproj"
             ],
             "problemMatcher": "$msCompile",
             "group": {

Duempelkas.slnx

@@ -1,11 +0,0 @@
-<Solution>
-  <Folder Name="/src/">
-    <Project Path="src/Duempelkas.App/Duempelkas.App.csproj" />
-    <Project Path="src/Duempelkas.Desktop/Duempelkas.Desktop.csproj" />
-    <Project Path="src/Duempelkas.Domain/Duempelkas.Domain.csproj" />
-    <Project Path="src/Duempelkas.Infrastructure/Duempelkas.Infrastructure.csproj" />
-  </Folder>
-  <Folder Name="/tests/">
-    <Project Path="tests/Duempelkas.Tests/Duempelkas.Tests.csproj" />
-  </Folder>
-</Solution>

tests/Duempelkas.Tests/DesktopResourceTests.cs

@@ -9,7 +9,7 @@ public class DesktopResourceTests
     public void StartupStylesAndFonts_AreDeliveredLocally()
     {
         var root = new DirectoryInfo(AppContext.BaseDirectory);
-        while (root != null && !File.Exists(Path.Combine(root.FullName, "Duempelkas.slnx"))) root = root.Parent;
+        while (root != null && !File.Exists(Path.Combine(root.FullName, "src", "Duempelkas.Desktop", "Duempelkas.Desktop.csproj"))) root = root.Parent;
         Assert.NotNull(root);
         var web = Path.Combine(root.FullName, "src", "Duempelkas.Desktop", "wwwroot");
         var html = File.ReadAllText(Path.Combine(web, "index.html"));

tests/Duempelkas.Tests/LayoutControlTests.cs

@@ -32,7 +32,7 @@ public class LayoutControlTests
         if (output == null) return;
         Directory.CreateDirectory(output);
         var root = new DirectoryInfo(AppContext.BaseDirectory);
-        while (root != null && !File.Exists(Path.Combine(root.FullName, "Duempelkas.slnx"))) root = root.Parent;
+        while (root != null && !File.Exists(Path.Combine(root.FullName, "src", "Duempelkas.Desktop", "Duempelkas.Desktop.csproj"))) root = root.Parent;
         var web = new Uri(Path.Combine(root!.FullName, "src", "Duempelkas.Desktop", "wwwroot") + Path.DirectorySeparatorChar).AbsoluteUri;
         File.WriteAllText(Path.Combine(output, name + ".html"), "<!doctype html><html lang='de'><head><meta charset='utf-8'><meta name='viewport' content='width=device-width, initial-scale=1'>" +
             $"<link rel='stylesheet' href='{web}vendor/bootstrap/bootstrap.min.css'><link rel='stylesheet' href='{web}vendor/bootstrap-icons/bootstrap-icons.min.css'><link rel='stylesheet' href='{web}css/app.css'>" +