chore: Add API Reference

Signed-off-by: Adam Harvey <adaharve@cisco.com>

plugins/apollo-explorer/api-report.md

@@ -40,6 +40,4 @@ export const apolloExplorerPlugin: BackstagePlugin<
   {},
   {}
 >;
-
-// (No @packageDocumentation comment for this package)
 ```

plugins/apollo-explorer/src/index.ts

@@ -13,4 +13,10 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
+/**
+ * Integrates Apollo Explorer graphs as a tool to browse GraphQL API endpoints inside Backstage.
+ *
+ * @packageDocumentation
+ */
 export { apolloExplorerPlugin, ApolloExplorerPage } from './plugin';