remove submodules not used for real robot

.gitmodules

@@ -6,22 +6,6 @@
 	path = src/panda_moveit_config
 	url = ../../packages/panda_moveit_config.git
 	branch = master
-[submodule "src/panda_simulation"]
-	path = src/panda_simulation
-	url = ../../packages/panda_simulation.git
-	branch = master
-[submodule "src/simulation_util"]
-	path = src/simulation_util
-	url = ../../packages/simulation_util.git
-	branch = noetic/main
-[submodule "src/gazebo_pkgs"]
-	path = src/gazebo_pkgs
-	url = ../../packages/gazebo-pkgs.git
-	branch = noetic/main
-[submodule "src/general_message_packages"]
-	path = src/general_message_packages
-	url = https://github.com/JenniferBuehler/general-message-pkgs.git
-	branch = master
 [submodule "src/panda_grasping"]
 	path = src/panda_grasping
 	url = ../../packages/panda_grasping.git

gazebo_pkgs @ 730d0ade

-Subproject commit 730d0ade150aedde1164388bdaf3d628527ad316

general_message_packages @ f0c7a0cc

-Subproject commit f0c7a0cc811187cca8e928bc7c5906e463c24945

panda_simulation @ 7d6668f7

-Subproject commit 7d6668f7391901e9f1f0039c20733eec731fc68f

simulation_util @ ecc8e6e0

-Subproject commit ecc8e6e06c36c3674cd9851987499cbbaa31747c