Feature/show extension repo only in case more than one repo is set (#543)

* Rename "isSingleRepoSet" prop to "showSourceRepo"

* Show repo of source in case sources of different repos are installed

* Center the source icon

src/lib/graphql/Fragments.ts

@@ -59,6 +59,10 @@ export const PARTIAL_SOURCE_FIELDS = gql`
         lang
         name
         supportsLatest
+        extension {
+            pkgName
+            repo
+        }
     }
 `;