Remove the "prettify.js" and "prettify.css" due to license issues with Apache2.
Post Jason's patch.
commit 2c27e3ea04dbd0376db5652a124b3c518ed20699 (Bitbake rev: 6361698819530382541506b06a61f2c76dde59cb)
Plus: commit 96967261993f8b583b51cdeccbb1fd06042d2192 Author: Richard Purdie <richard.purdie@linuxfoundation.org> Date: Tue Oct 10 11:01:38 2017 +0100 bitbake: toaster/highlight.pack.js: Fix corrupted file The newly added file in the last commit was corrupted, fix it. (Bitbake rev: be393f247a08c0a4a50a6a76b8fd57f78295d2a1)