message: Update README with new web app name
diff: @@ -12,7 +12,7 @@ Performance
  An extensive database of up-to-date benchmark results is available in the
  [performance data reposotiry](https://github.com/ginkgo-project/ginkgo-data).
  Visualizations of the database can be interactively generated using the
  -[Ginkgo Benchmark Explorer web application](https://ginkgo-project.github.io/ginkgo-benchmark-explorer).
  +[Ginkgo Performance Explorer web application](https://ginkgo-project.github.io/gpe).
  The benchmark results are automatically updated using the CI system to always
  reflect the current state of the library.
  