only run FTE if the config flag is set
only run FTE if the config flag is set

By default, we won't run the FTE. However, for specific sites (ex: the
Betterlink homepage), we can safely turn this on.

Before making available generally, we would want to:
- safeguard the styles from page-specific overrides (like we do for the
drawer)
- enable local storage (or something) that indicates across any page
whether a user has seen the FTE

betterlink/betterlink-interface,betterlink/betterlink-interface