Update page build trigger (#21)

* replace "deployment" with "page_build"

* Fix manually constructed URL

* Fix indent error

Author: brianamarie

config.yml

@@ -55,9 +55,14 @@ steps:
   #2 - Turn on GitHub Pages
   - title: "Turn on GitHub Pages"
     description: "Create serve your repository contents on a web page using GitHub Pages."
-    event: "deployment"
+    event: page_build
     link: '{{ repoUrl }}/settings'
     actions:
+      - type: octokit
+        method: repos.getPages
+        owner: '%payload.repository.owner.login%'
+        repo: '%payload.repository.name%'
+        action_id: pagesUrl
       - type: createPullRequest
         action_id: pr
         title: Give your portfolio a header