Revert "SSP-2342 Fix script type but comment out NR header/footer"

This reverts commit 47f778cbe47f0f9bbf928e0da57c9a6caa21f1eb.
Revert "SSP-2342 Attempt to fix up XML escaping in NR header/footer"

This reverts commit 0e09f61850c52efbacf9e99b3eb54daf8d2193e3.
Revert "SSP-2342 Possibly temp attempt at NR browser timing"

This reverts commit ebc219ae82de78560c575d8aa0e255374260f103.