Remove all submodules

Removed all submodules added during the initial phase of repository
restructuring eariler this year.

After working with individual repositories for each set of container
definition files for the past several months, maintenance of this
central repository for the project lapsed and it became clear that
managing many smaller repositories both created additional complexity
and reduced the overall discoverability of the latest container
definition files for users.

All of the latest definition files will be re-committed to and tracked
only by this repository moving forward. A new naked-singularity.sh
helper script will also be created, where the initial functionality will
focus on helping users compile and install Singularity 3.x from source.

.gitmodules

-[submodule "centos"]
-	path = centos
-	url = https://github.com/mkandes/centos.git
-[submodule "centos-cuda"]
-	path = centos-cuda
-	url = https://github.com/mkandes/centos-cuda.git
-[submodule "centos-cuda-openmpi"]
-	path = centos-cuda-openmpi
-	url = https://github.com/mkandes/centos-cuda-openmpi.git
-[submodule "centos-mvapich"]
-	path = centos-mvapich
-	url = https://github.com/mkandes/centos-mvapich.git
-[submodule "centos-openmpi"]
-	path = centos-openmpi
-	url = https://github.com/mkandes/centos-openmpi.git
-[submodule "ubuntu"]
-	path = ubuntu
-	url = https://github.com/mkandes/ubuntu.git
-[submodule "ubuntu-cuda"]
-	path = ubuntu-cuda
-	url = https://github.com/mkandes/ubuntu-cuda.git
-[submodule "ubuntu-cuda-openmpi"]
-	path = ubuntu-cuda-openmpi
-	url = https://github.com/mkandes/ubuntu-cuda-openmpi.git
-[submodule "ubuntu-mvapich"]
-	path = ubuntu-mvapich
-	url = https://github.com/mkandes/ubuntu-mvapich.git
-[submodule "ubuntu-openmpi"]
-	path = ubuntu-openmpi
-	url = https://github.com/mkandes/ubuntu-openmpi.git
-[submodule "beast"]
-	path = beast
-	url = https://github.com/mkandes/beast.git
-[submodule "beast2"]
-	path = beast2
-	url = https://github.com/mkandes/beast2.git
-[submodule "fenics"]
-	path = fenics
-	url = https://github.com/mkandes/fenics.git
-[submodule "mxnet"]
-	path = mxnet
-	url = https://github.com/mkandes/mxnet.git
-[submodule "pytorch"]
-	path = pytorch
-	url = https://github.com/mkandes/pytorch.git
-[submodule "tensorflow"]
-	path = tensorflow
-	url = https://github.com/mkandes/tensorflow.git

beast @ 0b923843

-Subproject commit 0b923843ac34ece9f997ee6ddaaea4e7c519296b

beast2 @ ec6490df

-Subproject commit ec6490dfda311933427707767986de0a53efe68c

centos @ 239f110a

-Subproject commit 239f110ab89f7e62ba57b9adfc12496340140003

centos-cuda @ 632c8f24

-Subproject commit 632c8f2425f8c36e39229800fabb827702534a68

centos-cuda-openmpi @ 7d688ee3

-Subproject commit 7d688ee3580bb06b22d0cc2495bfe84113bb1e83

centos-mvapich @ dd44dc6a

-Subproject commit dd44dc6aa2df0e0e69aa9b778a8092bb308a96fd

centos-openmpi @ 93675d53

-Subproject commit 93675d53cff6d25d3d5c49b3dc0764d661964815

fenics @ 4b178e8e

-Subproject commit 4b178e8e042b66a1ac09d689ebc9620a666048e4

mxnet @ cd7bbfa0

-Subproject commit cd7bbfa09f7a4e6c103724eccab0b842fd63b6c0

pytorch @ 1244f7d5

-Subproject commit 1244f7d55977f25b6917b936a301f66727eb7d88

tensorflow @ 65c4bea0

-Subproject commit 65c4bea0fa3db65301b2b01c1fad598770ce4e28

ubuntu @ 4c8bfdde

-Subproject commit 4c8bfdde5abde4ea5b0c3a0ed45e73324ba8ef26

ubuntu-cuda @ 2d432064

-Subproject commit 2d43206463210b9f6c90ba6c8204943fe0b04e4c

ubuntu-cuda-openmpi @ 2fb59e19

-Subproject commit 2fb59e19a6e1705652be1bbe75a850768ecd82ca

ubuntu-mvapich @ 0b2f81a3

-Subproject commit 0b2f81a30684fb287f6b36a89a71053d9b967639

ubuntu-openmpi @ 44b5d7de

-Subproject commit 44b5d7de507376d3d0a3a62ed12acdaa69382ea0