Added _images symlink for migrating to the new rewrite system

diff --git a/wwwroot/_images b/wwwroot/_images
new file mode 120000 (symlink)
index 0000000..4bd300f
--- /dev/null
+++ b/wwwroot/_images
@@ -0,0 +1 @@
+_data/images/
\ No newline at end of file