[DOC] Add links to the github pages in the README

Author: tbouffard

README.md

@@ -4,6 +4,10 @@ Let's play with GitHub Actions!
 
 We use this repository to test and configure GitHub Workflows prior their real usage in repositories of the [Process Analytics organization](https://github.com/process-analytics).
 
+GitHub pages environment generated by this repository
+- Home: https://process-analytics.github.io/github-actions-playground/
+- Typedoc API: https://process-analytics.github.io/github-actions-playground/api/
+
 ## Non exhaustive list
 
 - [detect PR type (opened, closed, ...)](.github/workflows/detect-pr-type.yml): log if the PR is closed. To use for surge-preview: don't failOnError when closing PR. Pull Requests created by dependabot don't deploy to surge, but when a contributor is merging the PR, the teardown fails as there is no deployment.