Add the jest link

docs/guides/getting_started.html.md

@@ -33,7 +33,7 @@ To get yourself started, try this as your Dangerfile:
 
 ```js
 import { message, danger } from "danger"
-message("OK, this worked @" + danger.github.pr.user.login)
+message(":tada:, this worked @" + danger.github.pr.user.login)
 ```
 
 Which, once you have your authentication set up, will have danger post a message to your PR with your name.
@@ -103,8 +103,7 @@ Danger is built to run as a part of this process, so you will need to have this
 You should be able to verify that you have successfully integrated Danger by either re-building your CI or pushing your new commits.
 
 
-
-[jest-config]: SBJDSKDJBSDKJBG
+[jest-config]: https://facebook.github.io/jest/docs/configuration.html
 [github_bots]: https://twitter.com/sebastiangrail/status/750844399563608065
 [github_token]: https://github.com/settings/tokens/new
 [Yarn]: https://yarnpkg.com