Add Gitea Actions workflows and remove old Dell logo

- Add build.yaml for CI on push/PR
- Add release.yaml for automated releases on version tags
- Remove unused DellLogo.ico

To create a release, push a tag: git tag v1.0.0 && git push --tags

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

DellMonitorControl/DellMonitorControl.csproj

@@ -26,12 +26,10 @@
 	</PropertyGroup>
 
 	<ItemGroup>
-	  <None Remove="DellLogo.ico" />
 	  <None Remove="MonitorIcon.ico" />
 	</ItemGroup>
 
 	<ItemGroup>
-	  <Resource Include="DellLogo.ico" />
 	  <Resource Include="MonitorIcon.ico" />
 	</ItemGroup>