chore(git): reference submodule without requiring auth

SKoschnicke · SKoschnicke · commit a201c8dd1827 · 2021-03-11T13:45:31.000+01:00
diff --git a/.gitmodules b/.gitmodules
@@ -1,3 +1,3 @@
 [submodule ".idea"]
 	path = .idea
-	url = git@github.com:CAU-Kiel-Tech-Inf/idea-config.git
+	url = https://github.com/CAU-Kiel-Tech-Inf/idea-config.git
