Revert "Point to the redirector for the URL without trailing slash."

This reverts commit cb9b2e0c1d8ec56f5a09f3e5c584a05677226d4b.
Revert "Redirect to make sure the summit site URL has a trailing slash."

This reverts commit d5a5897d324b076ed0fbff75fc88a6b0f78fc197.