Remove previous tutorials

.gitmodules

-[submodule "tutorials/analytics-nn-regression"]
-	path = tutorials/analytics-nn-regression
-	url = https://gitlab.mpcdf.mpg.de/nomad-lab/analytics-nn-regression
-[submodule "tutorials/analytics-query-nomad-archive"]
-	path = tutorials/analytics-query-nomad-archive
-	url = https://gitlab.mpcdf.mpg.de/nomad-lab/analytics-query-nomad-archive.git
-[submodule "tutorials/analytics-exploratory-analysis"]
-	path = tutorials/analytics-exploratory-analysis
-	url = https://gitlab.mpcdf.mpg.de/nomad-lab/analytics-exploratory-analysis.git
-[submodule "tutorials/analytics-convolutional-nn"]
-	path = tutorials/analytics-convolutional-nn
-	url = https://gitlab.mpcdf.mpg.de/nomad-lab/analytics-convolutional-nn.git
 [submodule "files/cpp_sisso"]
 	path = files/cpp_sisso
 	url = https://gitlab.mpcdf.mpg.de/nomad-lab/cpp_sisso.git

analytics-convolutional-nn @ 36cbbfa3

-Subproject commit 36cbbfa3cbb719b15e1ed9eb0887c13ca1e212ce

analytics-exploratory-analysis @ 480ccc6b

-Subproject commit 480ccc6ba841af377fea7a480a6cd889ede1f5ef

analytics-nn-regression @ e9d4c9f2

-Subproject commit e9d4c9f296428657921bd463dcf79418a8beff44

analytics-query-nomad-archive @ 6328a043

-Subproject commit 6328a04340e66f383876e7c408bcf0fe7e3abbbc