* gnu/services/base.scm (%default-console-font): New variable.
(console-font-shepherd-services): New procedure.
(console-font-service-type): Change to use 'service-type'.
(console-font-service): Rewrite using 'simple-service'.
(%base-services): Use a single CONSOLE-FONT-SERVICE-TYPE instance.
* gnu/system/install.scm (installation-services): Likewise.