delete 'templates-sdk-dev', all these files were merged back into 'templates-sdk' with this CL: https://googleplex-android-review.git.corp.google.com/#/c/1394582/ and this depends on the following CL to update all the doc build targets: https://googleplex-android-review.git.corp.google.com/#/c/1406302/ am: 6c8efecbda
am: 21c9005ff1

Change-Id: Ie20f642bcbadec94524189f74bb06312fb232bdf