chore: remove generated build artifacts

Agent-Logs-Url: https://github.com/dennisdoomen/CSharpGuidelines/sessions/2204c2c3-0c9b-4950-bc91-79931ab96c96

Co-authored-by: dennisdoomen <572734+dennisdoomen@users.noreply.github.com>

Author: Copilot

.gitignore

@@ -11,3 +11,5 @@ _site
 /.nuke/temp
 /build/bin
 /build/obj
+/Build/bin
+/Build/obj