update_manager needs to be updated

[shackleford92]

What happened

both in documentation and the work of the install script, the update_manager entry is

INCORRECT
[update_manager crowsnest]
type: git_repo
path: ~/crowsnest
origin: https://github.com/mainsail-crew/crowsnest.git
install_script: tools/pkglist.sh

CORRECT
[update_manager crowsnest]
type: git_repo
path: ~/crowsnest
origin: https://github.com/mainsail-crew/crowsnest.git
managed_services: crowsnest
install_script: tools/install.sh

What did you expect to happen

moonraker to be content

How to reproduce

install and reboot, moonraker throws an error for the nonexistent pkglist.sh

Additional information

No response

[meteyou]

duplicate of #150, #186 and #242