* rosenthal/services/networking.scm (tailscale-configuration): New data type.
(tailscale-shepherd-service,tailscale-service-type): New variables.
* README.org: Update.
* rosenthal/services/child-error.scm (<shadow-tls-configuration>)
(<shadow-tls-client-configuration>,<shadow-tls-server-configuration>): New
record types.
(shadow-tls-service-type,home-shadow-tls-service-type): New variables.
* README.org (Services): Add them.