Deleted parameter register-cmake-module

[krealyt]

@hikinggrass I deleted the register-cmake-module parameter here. Two questions before I create a PR:

1. Do we need info about the implicit registration of edm-registration in the docu? Is that somehow relevant during the development process?
2. The --update parameter seems also to be deleted from edm. I would delete the section about updating here also. Is the --git-pull parameter a 1:1 replacement for --update?

[hikinggrass]

@hikinggrass I deleted the register-cmake-module parameter here. Two questions before I create a PR:

1. Do we need info about the implicit registration of edm-registration in the docu? Is that somehow relevant during the development process?

Not anymore, the parameter has been removed because the whole process works differently now using everest-cmake and needs no manual intervention from the user

2. The --update parameter seems also to be deleted from edm. I would delete the section about updating here also. Is the --git-pull parameter a 1:1 replacement for --update?

More or less, for pulling the repos you can use the --git-pull parameter, for updating to a new release you could also just use edm init again