feat: relative submodules

.gitmodules

 [submodule "submodules/i18n"]
 	path = submodules/i18n
-	url = git@git.coopdevs.org:codeccoop/wp/wpct-i18n.git
+	url = ../wpct-i18n.git
 [submodule "abstracts"]
 	path = abstracts
-	url = git@git.coopdevs.org:codeccoop/wp/plugins/wpct-plugin-abstracts.git
+	url = ../wpct-plugin-abstracts.git