s/#team-building/#teams/g

Fixes issue with linking to `#team-building` by replacing all instances of it with `#teams` which doesn't seem to exhibit the same behaviour.

Not sure if this will fly since if someone has linked to `#team-building` directly from somewhere else on the web that person will not be smooth scrolled down to the teams section. If this is a requirement for fixing this bug I can probably mix in something to this PR to make sure that we are backwards compatible to this link. 

[Bugzilla bug 933991](https://bugzilla.mozilla.org/show_bug.cgi?id=933991).