Add a prominent warning to the config reference (#9558)
Add a prominent warning to the config reference (#9558)

Readers may be tempted to copy the entire reference configuration
for their own Teleport deployments. This changes the config
reference to include a more explicit and prominent warning against
doing so, and recommends using the "teleport configure" command.

Closes #3244
gravitational/teleport,gravitational/teleport,gravitational/teleport,gravitational/teleport,gravitational/teleport,gravitational/teleport