packages,plugins: add package documentation

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

packages/integration-react/api-report.md

@@ -30,6 +30,4 @@ export class ScmIntegrationsApi {
 //
 // @public (undocumented)
 export const scmIntegrationsApiRef: ApiRef<ScmIntegrationRegistry>;
-
-// (No @packageDocumentation comment for this package)
 ```

packages/integration-react/src/index.ts

@@ -14,5 +14,11 @@
  * limitations under the License.
  */
 
+/**
+ * Frontend package for managing integrations towards external systems
+ *
+ * @packageDocumentation
+ */
+
 export * from './api';
 export * from './components';