remove info about gitlab runner registration token

Experience shows that a single registration token for both shared and
project-locked runners (eg. shadow) works fine. Will add bits about
custom roles for runners in subsequent commit.

service/ci.md

@@ -187,20 +187,7 @@ module from Voxpupuli to avoid reinventing the wheel. But before
 enabling it on the instance, the following operations need to be
 performed:
 
- 1. The shared runner token needs to be setup in Trocla, using:
-
-        trocla create profile::gitlab::runner::token plain
-
-    NOTE: this was probably already done. If you need a more specific
-    runner (say group- or project-specific), a new Role
-    (e.g. `roles::gitlab::runner::docker::tpa` could be created and
-    pass a different token (set in Trocla like the above).
-    
-    TODO: this is one case where the Trocla Hiera support (which we do
-    not currently use), could come in handy. See our [Puppet Trocla
-    docs](howto/puppet#trocla) for more details.
-
- 2. setup the large partition in `/srv`, and bind-mount it to cover
+ 1. setup the large partition in `/srv`, and bind-mount it to cover
     for Docker:
 
         mkfs -t ext4 -j /dev/sdc