Update urls to submodules

.gitmodules

 [submodule "bootloader"]
 	path = bootloader
-	url = https://github.com/redox-os/bootloader.git
+	url = https://gitlab.redox-os.org/redox-os/bootloader.git
+[submodule "bootloader-efi"]
+	path = bootloader-efi
+	url = https://gitlab.redox-os.org/redox-os/bootloader-efi.git
 [submodule "cookbook"]
 	path = cookbook
-	url = https://github.com/redox-os/cookbook.git
+	url = https://gitlab.redox-os.org/redox-os/cookbook.git
 [submodule "installer"]
 	path = installer
-	url = https://github.com/redox-os/installer.git
+	url = https://gitlab.redox-os.org/redox-os/installer.git
 [submodule "isolinux"]
 	path = isolinux
-	url = https://github.com/redox-os/isolinux.git
+	url = https://gitlab.redox-os.org/redox-os/isolinux.git
 [submodule "kernel"]
 	path = kernel
-	url = https://github.com/redox-os/kernel.git
+	url = https://gitlab.redox-os.org/redox-os/kernel.git
 [submodule "rust"]
 	path = rust
-	url = https://github.com/redox-os/rust.git
+	url = https://gitlab.redox-os.org/redox-os/rust.git
 [submodule "redoxfs"]
 	path = redoxfs
-	url = https://github.com/redox-os/redoxfs.git
-[submodule "bootloader-efi"]
-	path = bootloader-efi
-	url = https://github.com/redox-os/bootloader-efi.git
+	url = https://gitlab.redox-os.org/redox-os/redoxfs.git