project: reorganize the structure of the project.

* remove dotnet-tool.json because the project does not rely on any dotnet tools.
* remove Directory.Build.props because the solution has only one project.
* move src/SourceGit to src. It's not needed to put all sources into a subfolder of src since there's only one project.

src/Views/CommitBaseInfo.axaml.cs

@@ -0,0 +1,22 @@
+using Avalonia.Controls;
+using Avalonia.Input;
+
+namespace SourceGit.Views
+{
+    public partial class CommitBaseInfo : UserControl
+    {
+        public CommitBaseInfo()
+        {
+            InitializeComponent();
+        }
+
+        private void OnParentSHAPressed(object sender, PointerPressedEventArgs e)
+        {
+            if (DataContext is ViewModels.CommitDetail detail)
+            {
+                detail.NavigateTo((sender as Control).DataContext as string);
+            }
+            e.Handled = true;
+        }
+    }
+}