Modify theme directory view so subfolders are always at top

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Modify the directory view so that directory sub folders are always at the top. 99% of the time a developer is looking for the views directory.

We have previously highlighted this directory visually to quickly scan and find the directory when column sorted. However, because of the default alphabetical sorting, this folder is always toward the bottom of the page, if not below the fold making it more difficult then needed to access.

Having the sub folders always pinned to the top provides quicker access to the views folder.