Remove deprecated @App section
Remove deprecated @App section

The [https://github.com/lathonez/clicker/](Clicker) code has been kept up to date and removed the usage of the App decorator, but this blog post still has a section about it. It looks to me like it's no longer relevant because [https://github.com/lathonez/clicker/blob/master/test/karma.config.js](karma.conf.js) no longer contains a `templateUrl` setting.

Thanks for the post - it's a great guide to getting tests in to an Ionic project project!

- Removed App decorator section from blog post
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