transparency in logo

README.md

@@ -1,12 +1,4 @@
-<p align="center">
-  <a href="https://www.nuget.org/packages/migtool">
-    <img
-      src="https://raw.githubusercontent.com/lamg/migrate/master/doc/images/logo.png"
-      alt="Migrate – Declarative migrations with SQL"
-      style="border-radius: 50%;width: 100px"
-    />
-  </a>
-</p>
+[![logo](doc/images/logo.png)][migtool]
 
 [![NuGet Version][nuget-version]][migtool]
 [![NuGet Downloads][nuget-downloads]][migtool]
@@ -77,4 +69,4 @@ See [contributing_guideline](doc/contributing_guideline.md)
 [MigrateLib]: https://www.nuget.org/packages/MigrateLib
 [nuget-version]: https://img.shields.io/nuget/v/migtool?style=flat-square
 [nuget-downloads]: https://img.shields.io/nuget/dt/migtool?style=flat-square
-[tests]: https://img.shields.io/github/actions/workflow/status/lamg/migrate/test.yml?style=flat-square&label=tests
+[tests]: https://img.shields.io/github/actions/workflow/status/lamg/migrate/test.yml?style=flat-square&label=tests