Remove submodule 'NeuralNets' and 'Moderne-Physik'

.gitmodules

@@ -1,9 +1,3 @@
-[submodule "documents/Moderne-Physik"]
-	path = documents/Moderne-Physik
-	url = https://github.com/parttimenerd/Moderne-Physik
-[submodule "documents/NeuralNets"]
-	path = documents/NeuralNets
-	url = https://github.com/Marvin182/NeuralNets.git
 [submodule "documents/GeoTopo"]
 	path = documents/GeoTopo
 	url = https://github.com/MartinThoma/GeoTopo.git

documents/Moderne-Physik

@@ -1 +0,0 @@
-Subproject commit edaa9afed626737344b2930b82a19844f8820bb2

documents/NeuralNets

@@ -1 +0,0 @@
-Subproject commit 7689bec0c5ba1998196171f706f895abb5ddb475