project: stop symlinking description file under .git/

Nothing uses this path.  It’s only for exporting git dirs e.g. for
online gitweb use which probably no one does.  It is not the same
description file as exists on servers we cloned from.  Leaving it
as the default plain text file will simplify code.

We don't undo any existing symlinks if they exist since repo does
not care about them, and their existence doesn't hurt.

Bug: https://crbug.com/gerrit/15460
Change-Id: Ic34fe7c3cfb8f6da844de5be30158f59382b1cc8
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/327518
Reviewed-by: Jonathan Nieder <jrn@google.com>
Tested-by: Mike Frysinger <vapier@google.com>
diff --git a/project.py b/project.py
index db44cde..a764b95 100644
--- a/project.py
+++ b/project.py
@@ -457,7 +457,7 @@
 
 class Project(object):
   # These objects can be shared between several working trees.
-  shareable_files = ['description', 'info']
+  shareable_files = ['info']
   shareable_dirs = ['hooks', 'objects', 'rr-cache']
 
   def __init__(self,