Remove now-unused Arcade content (#1158)

Author: dagood

.gitattributes

@@ -2,20 +2,3 @@
 # "git diff header lacks filename information when removing 1 leading pathname component".
 # To fix this, always check out patch files as LF.
 *.patch -text
-
-# The below lines apply autocrlf to a few specific files and folders to make
-# them work nicely with dotnet/arcade's auto-update infrastructure.
-#
-# "darc update" is the auto-update command for dotnet/arcade, and it updates
-# file content in a way that ends up with CRLF on Windows and LF on Linux. This
-# can cause thrashing when checked in without autocrlf. We fix this by adding
-# normalization that matches the way Arcade expects it to work:
-# https://github.com/dotnet/arcade/blob/ec35b4879466a6071c16db8fa3ce5d2dca0dfbe8/.gitattributes
-
-/eng/common/** text=auto encoding=UTF-8
-/eng/Version.Details.xml text=auto encoding=UTF-8
-/eng/Versions.props text=auto encoding=UTF-8
-/global.json text=auto encoding=UTF-8
-/NuGet.config text=auto encoding=UTF-8
-
-/eng/common/**/*.sh text eol=lf